Year | Value | 2022 | 23,579 | 2021 | 23,005 | 2020 | 22,515 | 2019 | 22,148 | 2018 | 21,953 | 2017 | 21,897 | 2016 | 21,901 | 2015 | 21,972 | 2014 | 22,089 | 2013 | 22,203 | 2012 | 22,255 | 2011 | 22,157 | 2010 | 21,893 | 2009 | 21,500 | 2008 | 21,020 | 2007 | 20,528 | 2006 | 20,101 | 2005 | 19,797 | 2004 | 19,684 | 2003 | 19,694 | 2002 | 19,788 | 2001 | 19,970 | 2000 | 20,113 | 1999 | 20,161 | 1998 | 20,166 | 1997 | 20,193 | 1996 | 20,289 | 1995 | 20,467 | 1994 | 20,687 | 1993 | 21,002 | 1992 | 21,301 | 1991 | 21,395 | 1990 | 21,234 | 1989 | 20,684 | 1988 | 19,755 | 1987 | 18,669 | 1986 | 17,529 | 1985 | 16,379 | 1984 | 15,357 | 1983 | 14,506 | 1982 | 13,794 | 1981 | 13,179 | 1980 | 12,633 | 1979 | 12,350 | 1978 | 12,222 | 1977 | 11,982 | 1976 | 11,713 | 1975 | 11,490 | 1974 | 11,346 | 1973 | 11,271 | 1972 | 11,238 | 1971 | 11,144 | 1970 | 10,986 | 1969 | 10,867 | 1968 | 10,799 | 1967 | 10,789 | 1966 | 10,818 | 1965 | 10,831 | 1964 | 10,733 | 1963 | 10,439 | 1962 | 10,040 | 1961 | 9,708 | 1960 | 9,433 |
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