Year | Value | 2023 | 35,711 | 2022 | 30,363 | 2021 | 28,446 | 2020 | 31,077 | 2019 | 36,353 | 2018 | 42,585 | 2017 | 48,480 | 2016 | 52,706 | 2015 | 54,676 | 2014 | 54,976 | 2013 | 53,992 | 2012 | 52,011 | 2011 | 49,238 | 2010 | 46,996 | 2009 | 45,907 | 2008 | 44,713 | 2007 | 42,891 | 2006 | 41,124 | 2005 | 38,369 | 2004 | 34,390 | 2003 | 30,309 | 2002 | 26,505 | 2001 | 23,661 | 2000 | 21,114 | 1999 | 18,797 | 1998 | 16,840 | 1997 | 15,403 | 1996 | 14,389 | 1995 | 13,617 | 1994 | 13,350 | 1993 | 13,579 | 1992 | 13,939 | 1991 | 14,523 | 1990 | 14,861 | 1989 | 15,102 | 1988 | 15,283 | 1987 | 15,324 | 1986 | 15,112 | 1985 | 14,773 | 1984 | 14,319 | 1983 | 13,849 | 1982 | 13,459 | 1981 | 13,129 | 1980 | 12,877 | 1979 | 12,731 | 1978 | 12,653 | 1977 | 12,655 | 1976 | 12,748 | 1975 | 12,846 | 1974 | 12,903 |
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