| Year | Value | | 2023 | 333,935 | | 2022 | 348,815 | | 2021 | 368,016 | | 2020 | 392,125 | | 2019 | 415,878 | | 2018 | 439,592 | | 2017 | 463,386 | | 2016 | 478,919 | | 2015 | 483,212 | | 2014 | 480,296 | | 2013 | 472,834 | | 2012 | 461,937 | | 2011 | 448,324 | | 2010 | 433,259 | | 2009 | 416,712 | | 2008 | 394,409 | | 2007 | 371,981 | | 2006 | 356,181 | | 2005 | 346,065 | | 2004 | 342,309 | | 2003 | 343,266 | | 2002 | 348,242 | | 2001 | 356,910 | | 2000 | 368,565 | | 1999 | 383,463 | | 1998 | 401,134 | | 1997 | 418,612 | | 1996 | 434,728 | | 1995 | 449,568 | | 1994 | 462,536 | | 1993 | 474,647 | | 1992 | 484,531 | | 1991 | 489,639 | | 1990 | 491,277 | | 1989 | 487,351 | | 1988 | 477,977 | | 1987 | 466,014 | | 1986 | 452,032 | | 1985 | 437,450 | | 1984 | 421,645 | | 1983 | 405,627 | | 1982 | 389,947 | | 1981 | 375,658 | | 1980 | 363,921 | | 1979 | 354,473 | | 1978 | 350,324 | | 1977 | 352,805 | | 1976 | 358,803 | | 1975 | 363,856 | | 1974 | 367,477 |
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