Year | Value | 2024 | 24,931 | 2023 | 24,687 | 2022 | 24,350 | 2021 | 23,875 | 2020 | 23,545 | 2019 | 23,566 | 2018 | 23,876 | 2017 | 24,513 | 2016 | 25,429 | 2015 | 26,520 | 2014 | 27,698 | 2013 | 28,898 | 2012 | 30,053 | 2011 | 31,079 | 2010 | 31,744 | 2009 | 31,926 | 2008 | 31,827 | 2007 | 31,610 | 2006 | 31,302 | 2005 | 30,895 | 2004 | 30,340 | 2003 | 29,603 | 2002 | 28,697 | 2001 | 27,655 | 2000 | 26,578 | 1999 | 25,611 | 1998 | 24,785 | 1997 | 24,038 | 1996 | 23,337 | 1995 | 22,675 | 1994 | 22,069 | 1993 | 21,542 | 1992 | 21,105 | 1991 | 20,759 | 1990 | 20,483 | 1989 | 20,306 | 1988 | 20,225 | 1987 | 20,156 | 1986 | 20,050 | 1985 | 19,928 | 1984 | 19,813 | 1983 | 19,639 | 1982 | 19,338 | 1981 | 18,914 | 1980 | 18,450 | 1979 | 17,887 | 1978 | 17,386 | 1977 | 17,188 | 1976 | 17,209 | 1975 | 17,394 |
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