| Year | Value | | 2023 | 1,949 | | 2022 | 1,908 | | 2021 | 1,836 | | 2020 | 1,731 | | 2019 | 1,615 | | 2018 | 1,502 | | 2017 | 1,416 | | 2016 | 1,365 | | 2015 | 1,331 | | 2014 | 1,293 | | 2013 | 1,236 | | 2012 | 1,143 | | 2011 | 1,034 | | 2010 | 927 | | 2009 | 826 | | 2008 | 750 | | 2007 | 702 | | 2006 | 665 | | 2005 | 626 | | 2004 | 577 | | 2003 | 519 | | 2002 | 465 | | 2001 | 425 | | 2000 | 403 | | 1999 | 385 | | 1998 | 368 | | 1997 | 351 | | 1996 | 327 | | 1995 | 307 | | 1994 | 294 | | 1993 | 284 | | 1992 | 266 | | 1991 | 251 | | 1990 | 235 | | 1989 | 211 | | 1988 | 188 | | 1987 | 173 | | 1986 | 161 | | 1985 | 152 | | 1984 | 145 | | 1983 | 141 | | 1982 | 140 | | 1981 | 138 | | 1980 | 137 | | 1979 | 133 | | 1978 | 123 | | 1977 | 112 | | 1976 | 108 | | 1975 | 106 |
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