Year | Value | 2024 | 19,721 | 2023 | 19,356 | 2022 | 19,328 | 2021 | 19,664 | 2020 | 20,669 | 2019 | 22,162 | 2018 | 23,594 | 2017 | 24,931 | 2016 | 26,073 | 2015 | 26,863 | 2014 | 27,294 | 2013 | 27,456 | 2012 | 27,373 | 2011 | 27,092 | 2010 | 26,690 | 2009 | 26,211 | 2008 | 25,684 | 2007 | 25,096 | 2006 | 24,426 | 2005 | 23,709 | 2004 | 23,013 | 2003 | 22,374 | 2002 | 21,791 | 2001 | 21,257 | 2000 | 20,739 | 1999 | 20,209 | 1998 | 19,705 | 1997 | 19,263 | 1996 | 18,891 | 1995 | 18,595 | 1994 | 18,367 | 1993 | 18,194 | 1992 | 18,066 | 1991 | 17,967 | 1990 | 17,895 | 1989 | 17,874 | 1988 | 17,878 | 1987 | 17,827 | 1986 | 17,680 | 1985 | 17,409 | 1984 | 17,023 | 1983 | 16,582 | 1982 | 16,123 | 1981 | 15,671 | 1980 | 15,213 | 1979 | 14,835 | 1978 | 14,556 | 1977 | 14,316 | 1976 | 14,162 | 1975 | 14,087 |
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