Year | Value | 2023 | 44,156 | 2022 | 41,325 | 2021 | 39,217 | 2020 | 40,044 | 2019 | 41,232 | 2018 | 41,132 | 2017 | 41,710 | 2016 | 42,198 | 2015 | 41,245 | 2014 | 38,803 | 2013 | 37,407 | 2012 | 37,954 | 2011 | 38,361 | 2010 | 38,395 | 2009 | 39,333 | 2008 | 41,157 | 2007 | 42,949 | 2006 | 43,732 | 2005 | 42,545 | 2004 | 38,672 | 2003 | 34,140 | 2002 | 32,623 | 2001 | 33,330 | 2000 | 33,981 | 1999 | 34,362 | 1998 | 34,364 | 1997 | 33,959 | 1996 | 33,172 | 1995 | 31,917 | 1994 | 30,014 | 1993 | 27,506 | 1992 | 24,641 | 1991 | 21,770 | 1990 | 20,689 | 1989 | 21,345 | 1988 | 21,993 | 1987 | 22,510 | 1986 | 22,829 | 1985 | 22,872 | 1984 | 22,587 | 1983 | 21,967 | 1982 | 21,056 | 1981 | 20,226 | 1980 | 20,290 | 1979 | 20,980 | 1978 | 21,440 | 1977 | 21,511 | 1976 | 21,109 | 1975 | 20,198 | 1974 | 18,842 |
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