| Year | Value | | 2024 | 252,213 | | 2023 | 260,821 | | 2022 | 270,316 | | 2021 | 279,614 | | 2020 | 289,131 | | 2019 | 297,696 | | 2018 | 304,225 | | 2017 | 310,301 | | 2016 | 317,047 | | 2015 | 321,738 | | 2014 | 323,814 | | 2013 | 323,774 | | 2012 | 320,434 | | 2011 | 315,500 | | 2010 | 312,733 | | 2009 | 314,923 | | 2008 | 321,762 | | 2007 | 331,638 | | 2006 | 342,314 | | 2005 | 352,204 | | 2004 | 360,525 | | 2003 | 367,167 | | 2002 | 371,688 | | 2001 | 373,672 | | 2000 | 374,080 | | 1999 | 374,679 | | 1998 | 377,215 | | 1997 | 383,447 | | 1996 | 394,480 | | 1995 | 411,015 | | 1994 | 430,685 | | 1993 | 449,078 | | 1992 | 461,724 | | 1991 | 465,922 | | 1990 | 461,190 | | 1989 | 450,306 | | 1988 | 437,908 | | 1987 | 425,771 | | 1986 | 410,202 | | 1985 | 392,970 | | 1984 | 380,209 | | 1983 | 372,365 | | 1982 | 371,952 | | 1981 | 385,275 | | 1980 | 411,263 | | 1979 | 442,972 | | 1978 | 477,602 | | 1977 | 512,674 | | 1976 | 546,093 | | 1975 | 575,459 |
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