| Year | Value | | 2024 | 311,877 | | 2023 | 302,600 | | 2022 | 299,456 | | 2021 | 309,446 | | 2020 | 330,520 | | 2019 | 356,192 | | 2018 | 387,360 | | 2017 | 423,134 | | 2016 | 455,882 | | 2015 | 480,962 | | 2014 | 499,607 | | 2013 | 512,027 | | 2012 | 517,003 | | 2011 | 518,982 | | 2010 | 524,500 | | 2009 | 533,493 | | 2008 | 541,240 | | 2007 | 542,713 | | 2006 | 533,500 | | 2005 | 512,513 | | 2004 | 482,103 | | 2003 | 445,821 | | 2002 | 410,937 | | 2001 | 383,523 | | 2000 | 364,777 | | 1999 | 353,742 | | 1998 | 349,098 | | 1997 | 348,082 | | 1996 | 347,936 | | 1995 | 347,322 | | 1994 | 345,749 | | 1993 | 343,153 | | 1992 | 339,524 | | 1991 | 335,024 | | 1990 | 329,898 | | 1989 | 324,140 | | 1988 | 317,895 | | 1987 | 311,392 | | 1986 | 304,713 | | 1985 | 297,774 | | 1984 | 290,546 | | 1983 | 283,038 | | 1982 | 275,078 | | 1981 | 266,534 | | 1980 | 258,946 | | 1979 | 252,990 | | 1978 | 247,622 | | 1977 | 242,868 | | 1976 | 238,994 | | 1975 | 235,848 |
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