| Year | Value | | 2024 | 374,764 | | 2023 | 365,282 | | 2022 | 357,157 | | 2021 | 346,288 | | 2020 | 330,537 | | 2019 | 316,866 | | 2018 | 307,737 | | 2017 | 304,706 | | 2016 | 314,921 | | 2015 | 336,428 | | 2014 | 362,747 | | 2013 | 394,642 | | 2012 | 431,063 | | 2011 | 464,078 | | 2010 | 489,208 | | 2009 | 507,802 | | 2008 | 519,683 | | 2007 | 524,829 | | 2006 | 527,856 | | 2005 | 534,304 | | 2004 | 544,356 | | 2003 | 553,857 | | 2002 | 555,490 | | 2001 | 544,334 | | 2000 | 521,434 | | 1999 | 490,257 | | 1998 | 455,278 | | 1997 | 422,321 | | 1996 | 395,681 | | 1995 | 376,819 | | 1994 | 365,429 | | 1993 | 359,500 | | 1992 | 356,860 | | 1991 | 355,807 | | 1990 | 354,609 | | 1989 | 352,565 | | 1988 | 349,623 | | 1987 | 345,713 | | 1986 | 341,032 | | 1985 | 335,841 | | 1984 | 330,089 | | 1983 | 323,843 | | 1982 | 317,352 | | 1981 | 310,724 | | 1980 | 303,978 | | 1979 | 297,472 | | 1978 | 291,582 | | 1977 | 286,236 | | 1976 | 281,189 | | 1975 | 276,333 |
|