| Year | Value | | 2024 | 269 | | 2023 | 255 | | 2022 | 244 | | 2021 | 233 | | 2020 | 220 | | 2019 | 207 | | 2018 | 192 | | 2017 | 178 | | 2016 | 165 | | 2015 | 153 | | 2014 | 148 | | 2013 | 148 | | 2012 | 143 | | 2011 | 135 | | 2010 | 128 | | 2009 | 122 | | 2008 | 116 | | 2007 | 112 | | 2006 | 110 | | 2005 | 109 | | 2004 | 107 | | 2003 | 106 | | 2002 | 107 | | 2001 | 108 | | 2000 | 110 | | 1999 | 114 | | 1998 | 117 | | 1997 | 123 | | 1996 | 132 | | 1995 | 135 | | 1994 | 128 | | 1993 | 123 | | 1992 | 121 | | 1991 | 119 | | 1990 | 119 | | 1989 | 116 | | 1988 | 108 | | 1987 | 98 | | 1986 | 88 | | 1985 | 79 | | 1984 | 76 | | 1983 | 77 | | 1982 | 79 | | 1981 | 82 | | 1980 | 82 | | 1979 | 78 | | 1978 | 75 | | 1977 | 73 | | 1976 | 73 | | 1975 | 76 |
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