| Year | Value | | 2023 | 175,800 | | 2022 | 155,377 | | 2021 | 153,037 | | 2020 | 176,794 | | 2019 | 221,053 | | 2018 | 274,939 | | 2017 | 326,464 | | 2016 | 368,151 | | 2015 | 396,648 | | 2014 | 413,344 | | 2013 | 423,814 | | 2012 | 435,656 | | 2011 | 456,719 | | 2010 | 494,189 | | 2009 | 503,611 | | 2008 | 442,610 | | 2007 | 335,384 | | 2006 | 224,711 | | 2005 | 156,470 | | 2004 | 147,431 | | 2003 | 165,329 | | 2002 | 181,356 | | 2001 | 192,364 | | 2000 | 195,549 | | 1999 | 188,686 | | 1998 | 170,797 | | 1997 | 142,651 | | 1996 | 106,863 | | 1995 | 88,220 | | 1994 | 91,038 | | 1993 | 95,123 | | 1992 | 98,349 | | 1991 | 99,579 | | 1990 | 97,837 | | 1989 | 92,173 | | 1988 | 81,983 | | 1987 | 67,541 | | 1986 | 50,128 | | 1985 | 40,848 | | 1984 | 40,690 | | 1983 | 39,810 | | 1982 | 37,665 | | 1981 | 34,720 | | 1980 | 34,991 | | 1979 | 38,102 | | 1978 | 39,096 | | 1977 | 36,686 | | 1976 | 30,675 | | 1975 | 28,193 | | 1974 | 30,609 |
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