Year | Value | 2022 | 36,697 | 2021 | 36,734 | 2020 | 36,148 | 2019 | 35,660 | 2018 | 34,013 | 2017 | 31,642 | 2016 | 30,330 | 2015 | 29,179 | 2014 | 28,341 | 2013 | 27,747 | 2012 | 27,360 | 2011 | 27,345 | 2010 | 27,730 | 2009 | 28,287 | 2008 | 28,936 | 2007 | 29,593 | 2006 | 30,193 | 2005 | 30,701 | 2004 | 31,079 | 2003 | 31,338 | 2002 | 31,663 | 2001 | 32,092 | 2000 | 32,510 | 1999 | 32,942 | 1998 | 33,385 | 1997 | 33,802 | 1996 | 34,161 | 1995 | 34,425 | 1994 | 34,586 | 1993 | 34,652 | 1992 | 34,659 | 1991 | 34,643 | 1990 | 34,815 | 1989 | 35,105 | 1988 | 35,230 | 1987 | 35,141 | 1986 | 34,815 | 1985 | 34,295 | 1984 | 33,641 | 1983 | 32,879 | 1982 | 32,061 | 1981 | 31,206 | 1980 | 30,295 | 1979 | 29,278 | 1978 | 28,113 | 1977 | 26,877 | 1976 | 25,666 | 1975 | 24,550 | 1974 | 23,556 | 1973 | 22,710 | 1972 | 22,017 | 1971 | 21,453 | 1970 | 21,057 | 1969 | 20,800 | 1968 | 20,590 | 1967 | 20,404 | 1966 | 20,220 | 1965 | 20,014 | 1964 | 19,784 | 1963 | 19,536 | 1962 | 19,273 | 1961 | 18,995 | 1960 | 18,701 |
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