| Year | Value | | 2024 | 46,436 | | 2023 | 40,509 | | 2022 | 40,608 | | 2021 | 39,336 | | 2020 | 44,950 | | 2019 | 42,674 | | 2018 | 42,867 | | 2017 | 43,632 | | 2016 | 44,686 | | 2015 | 45,488 | | 2014 | 43,064 | | 2013 | 38,539 | | 2012 | 36,319 | | 2011 | 36,153 | | 2010 | 36,431 | | 2009 | 35,665 | | 2008 | 31,125 | | 2007 | 25,281 | | 2006 | 19,811 | | 2005 | 19,288 | | 2004 | 19,787 | | 2003 | 19,155 | | 2002 | 19,044 | | 2001 | 18,594 | | 2000 | 17,767 | | 1999 | 16,552 | | 1998 | 14,971 | | 1997 | 13,240 | | 1996 | 12,306 | | 1995 | 12,175 | | 1994 | 12,096 | | 1993 | 12,068 | | 1992 | 12,079 | | 1991 | 12,092 | | 1990 | 12,036 | | 1989 | 11,839 | | 1988 | 11,465 | | 1987 | 10,911 | | 1986 | 10,285 | | 1985 | 9,892 | | 1984 | 9,708 | | 1983 | 9,499 | | 1982 | 9,254 | | 1981 | 8,955 | | 1980 | 8,594 | | 1979 | 8,165 | | 1978 | 7,671 | | 1977 | 7,141 | | 1976 | 6,613 | | 1975 | 6,110 |
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