| Year | Value | | 2024 | 425,833 | | 2023 | 429,666 | | 2022 | 435,397 | | 2021 | 447,733 | | 2020 | 469,224 | | 2019 | 494,097 | | 2018 | 519,044 | | 2017 | 539,287 | | 2016 | 546,462 | | 2015 | 537,404 | | 2014 | 518,380 | | 2013 | 494,118 | | 2012 | 468,702 | | 2011 | 439,706 | | 2010 | 408,798 | | 2009 | 380,632 | | 2008 | 354,146 | | 2007 | 331,235 | | 2006 | 310,868 | | 2005 | 295,601 | | 2004 | 287,197 | | 2003 | 281,547 | | 2002 | 278,487 | | 2001 | 280,273 | | 2000 | 286,098 | | 1999 | 289,964 | | 1998 | 286,627 | | 1997 | 279,010 | | 1996 | 271,545 | | 1995 | 266,336 | | 1994 | 268,243 | | 1993 | 278,119 | | 1992 | 284,562 | | 1991 | 281,629 | | 1990 | 275,769 | | 1989 | 270,382 | | 1988 | 265,467 | | 1987 | 260,904 | | 1986 | 255,535 | | 1985 | 248,983 | | 1984 | 241,439 | | 1983 | 227,937 | | 1982 | 208,054 | | 1981 | 188,771 | | 1980 | 153,094 | | 1979 | 125,527 | | 1978 | 134,358 | | 1977 | 147,203 | | 1976 | 149,949 | | 1975 | 148,117 |
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