| Year | Volume | |||
|---|---|---|---|---|
| 2026 | 89 |
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| 2025 | 88 |
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| 2024 | 87 |
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| 2023 | 86 |
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| 2022 | 85 |
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| 2021 | 84 |
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| 2020 | 83 |
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| 2019 | 82 |
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| 2018 | 81 |
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| 2017 | 80 |
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| 2016 | 79 |
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| 2015 | 78 |
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| 2014 | 77 |
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| 2013 | 76 |
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| 2012 | 75 |
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| 2011 | 74 |
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| 2010 | 73 |
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| 2009 | 72 |
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| 2008 | 71 |
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| 2007 | 70 |
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| 2006 | 69 |
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| 2005 | 68 |
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| 2004 | 67 |
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| 2003 | 66 |
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| 2002 | 65 |
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| 2001 | 64 |
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| 2000 | 63 |
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| 1999 | 62 |
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| 1998 | 61 |
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| 1997 | 60 |
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| 1996 | 59 |
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| 1995 | 58 |
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| 1994 | 57 |
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| 1993 | 56 |
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| 1992 | 55 |
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| 1991 | 54 |
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| 1990 | 53 |
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| 1989 | 52 |
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| 1988 | 51 |
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| 1987 | 50 |
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| 1986 | 49 |
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| 1985 | 48 |
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| 1984 | 47 |
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| 1983 | 46 |
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| 1982 | 45 |
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| 1981 | 44 |
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| 1980 | 43 |
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| 1979 | 42 |
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| 1978 | 41 |
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| 1977 | 40 |
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| 1976 | 39 |
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| 1975 | 38 |
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| 1974 | 37 |
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| 1973 | 36 |
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| 1972 | 35 |
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| 1971 | 34 |
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| 1970 | 33 |
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| 1968 | 31 |
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| 1967 | 30 |
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| 1966 | 29 |
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| 1965 | 28 |
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| 1964 | 27 |
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| 1963 | 26 |
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| 1962 | 25 |
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| 1961 | 24 |
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| 1960 | 23 |
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| 1959 | 22 |
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| 1958 | 21 |
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| 1957 | 20 |
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| 1956 | 19 |
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| 1955 | 18 |
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| 1954 | 17 |
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| 1953 | 16 |
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| 1952 | 15 |
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| 1951 | 14 |
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| 1950 | 13 |
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| 1949 | 12 |
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| 1948 | 11 |
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| 1947 | 10 |
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| 1946 | 9 |
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| 1945 | 8 |
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| 1944 | 7 |
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| 1943 | 6 |
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| 1942 | 5 |
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| 1941 | 4 |
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| 1940 | 3 |
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| 1939 | 2 |
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| 1938 | 1 |
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