| Year | Value | | 2024 | 457,654 | | 2023 | 482,226 | | 2022 | 503,258 | | 2021 | 510,091 | | 2020 | 499,047 | | 2019 | 477,872 | | 2018 | 451,882 | | 2017 | 422,997 | | 2016 | 390,676 | | 2015 | 358,335 | | 2014 | 328,315 | | 2013 | 299,367 | | 2012 | 276,056 | | 2011 | 257,972 | | 2010 | 242,678 | | 2009 | 231,919 | | 2008 | 225,136 | | 2007 | 221,549 | | 2006 | 219,457 | | 2005 | 219,784 | | 2004 | 222,525 | | 2003 | 224,217 | | 2002 | 224,800 | | 2001 | 226,507 | | 2000 | 230,248 | | 1999 | 233,498 | | 1998 | 233,818 | | 1997 | 232,908 | | 1996 | 233,184 | | 1995 | 235,085 | | 1994 | 240,942 | | 1993 | 251,002 | | 1992 | 251,667 | | 1991 | 244,547 | | 1990 | 239,805 | | 1989 | 233,962 | | 1988 | 221,872 | | 1987 | 204,042 | | 1986 | 186,889 | | 1985 | 170,887 | | 1984 | 155,696 | | 1983 | 146,168 | | 1982 | 140,843 | | 1981 | 134,789 | | 1980 | 124,325 | | 1979 | 118,022 | | 1978 | 121,262 | | 1977 | 123,022 | | 1976 | 121,474 | | 1975 | 118,805 |
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