| Year | Value | | 2023 | 382,283 | | 2022 | 403,615 | | 2021 | 423,849 | | 2020 | 441,610 | | 2019 | 455,873 | | 2018 | 461,836 | | 2017 | 461,449 | | 2016 | 459,480 | | 2015 | 455,487 | | 2014 | 448,684 | | 2013 | 440,003 | | 2012 | 429,150 | | 2011 | 415,639 | | 2010 | 400,469 | | 2009 | 384,941 | | 2008 | 366,743 | | 2007 | 350,214 | | 2006 | 338,323 | | 2005 | 327,374 | | 2004 | 317,262 | | 2003 | 307,365 | | 2002 | 299,080 | | 2001 | 293,235 | | 2000 | 291,930 | | 1999 | 294,661 | | 1998 | 302,932 | | 1997 | 313,027 | | 1996 | 320,267 | | 1995 | 322,364 | | 1994 | 317,826 | | 1993 | 314,762 | | 1992 | 317,949 | | 1991 | 325,920 | | 1990 | 335,497 | | 1989 | 344,368 | | 1988 | 346,995 | | 1987 | 345,979 | | 1986 | 342,199 | | 1985 | 330,086 | | 1984 | 309,088 | | 1983 | 282,026 | | 1982 | 257,568 | | 1981 | 238,722 | | 1980 | 222,410 | | 1979 | 208,326 | | 1978 | 199,299 | | 1977 | 192,192 | | 1976 | 178,017 | | 1975 | 156,983 | | 1974 | 133,409 |
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