Year | Value | 2022 | 22,077 | 2021 | 21,996 | 2020 | 21,910 | 2019 | 21,743 | 2018 | 21,585 | 2017 | 21,418 | 2016 | 21,237 | 2015 | 21,039 | 2014 | 20,851 | 2013 | 20,616 | 2012 | 20,449 | 2011 | 20,466 | 2010 | 20,591 | 2009 | 20,773 | 2008 | 21,079 | 2007 | 21,436 | 2006 | 21,688 | 2005 | 21,959 | 2004 | 22,166 | 2003 | 22,257 | 2002 | 22,204 | 2001 | 22,080 | 2000 | 21,940 | 1999 | 21,919 | 1998 | 21,892 | 1997 | 21,786 | 1996 | 21,656 | 1995 | 21,541 | 1994 | 21,368 | 1993 | 21,021 | 1992 | 20,429 | 1991 | 19,553 | 1990 | 18,458 | 1989 | 17,307 | 1988 | 16,326 | 1987 | 15,724 | 1986 | 15,652 | 1985 | 16,135 | 1984 | 17,007 | 1983 | 18,001 | 1982 | 18,869 | 1981 | 19,439 | 1980 | 19,624 | 1979 | 19,417 | 1978 | 18,917 | 1977 | 18,297 | 1976 | 17,714 | 1975 | 17,284 | 1974 | 17,002 | 1973 | 16,784 | 1972 | 16,562 | 1971 | 16,304 | 1970 | 15,997 | 1969 | 15,627 | 1968 | 15,160 | 1967 | 14,564 | 1966 | 13,800 | 1965 | 12,882 | 1964 | 11,892 | 1963 | 10,954 | 1962 | 10,197 | 1961 | 9,743 | 1960 | 9,647 |
|