Year | Value | 2022 | 22,951 | 2021 | 22,560 | 2020 | 22,362 | 2019 | 22,157 | 2018 | 21,823 | 2017 | 21,384 | 2016 | 21,015 | 2015 | 20,841 | 2014 | 20,733 | 2013 | 20,614 | 2012 | 20,526 | 2011 | 20,458 | 2010 | 20,437 | 2009 | 20,667 | 2008 | 20,965 | 2007 | 20,943 | 2006 | 20,782 | 2005 | 20,662 | 2004 | 20,696 | 2003 | 20,877 | 2002 | 21,098 | 2001 | 21,281 | 2000 | 21,369 | 1999 | 21,450 | 1998 | 21,592 | 1997 | 21,799 | 1996 | 22,059 | 1995 | 22,387 | 1994 | 22,718 | 1993 | 22,978 | 1992 | 23,203 | 1991 | 23,377 | 1990 | 23,571 | 1989 | 23,960 | 1988 | 24,240 | 1987 | 24,446 | 1986 | 24,765 | 1985 | 25,179 | 1984 | 25,582 | 1983 | 25,921 | 1982 | 26,192 | 1981 | 26,461 | 1980 | 26,783 | 1979 | 27,190 | 1978 | 27,620 | 1977 | 28,111 | 1976 | 28,616 | 1975 | 29,059 | 1974 | 29,419 | 1973 | 29,760 | 1972 | 30,053 | 1971 | 30,360 | 1970 | 30,870 | 1969 | 31,557 | 1968 | 32,123 | 1967 | 32,553 | 1966 | 32,905 | 1965 | 33,227 | 1964 | 33,533 | 1963 | 33,824 | 1962 | 34,110 | 1961 | 34,368 | 1960 | 34,588 |
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