| Year | Value | | 2023 | 55,947 | | 2022 | 53,770 | | 2021 | 52,353 | | 2020 | 50,858 | | 2019 | 49,189 | | 2018 | 47,525 | | 2017 | 45,917 | | 2016 | 44,426 | | 2015 | 42,987 | | 2014 | 41,536 | | 2013 | 40,207 | | 2012 | 38,972 | | 2011 | 37,718 | | 2010 | 36,485 | | 2009 | 35,230 | | 2008 | 33,970 | | 2007 | 32,733 | | 2006 | 31,436 | | 2005 | 30,083 | | 2004 | 28,719 | | 2003 | 27,352 | | 2002 | 26,088 | | 2001 | 25,011 | | 2000 | 24,050 | | 1999 | 23,132 | | 1998 | 22,261 | | 1997 | 21,393 | | 1996 | 20,530 | | 1995 | 19,700 | | 1994 | 18,914 | | 1993 | 18,153 | | 1992 | 17,407 | | 1991 | 16,706 | | 1990 | 16,045 | | 1989 | 15,382 | | 1988 | 14,720 | | 1987 | 14,075 | | 1986 | 13,444 | | 1985 | 12,847 | | 1984 | 12,289 | | 1983 | 11,769 | | 1982 | 11,275 | | 1981 | 10,791 | | 1980 | 10,299 | | 1979 | 9,844 | | 1978 | 9,554 | | 1977 | 9,377 | | 1976 | 9,796 | | 1975 | 12,207 | | 1974 | 14,012 |
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