Year | Value | 2022 | 19,115 | 2021 | 19,399 | 2020 | 19,787 | 2019 | 20,089 | 2018 | 20,344 | 2017 | 20,544 | 2016 | 20,745 | 2015 | 21,118 | 2014 | 21,553 | 2013 | 21,866 | 2012 | 22,161 | 2011 | 22,371 | 2010 | 22,324 | 2009 | 22,243 | 2008 | 22,366 | 2007 | 22,659 | 2006 | 23,045 | 2005 | 23,567 | 2004 | 24,237 | 2003 | 24,786 | 2002 | 25,020 | 2001 | 25,126 | 2000 | 25,095 | 1999 | 25,083 | 1998 | 25,075 | 1997 | 25,091 | 1996 | 25,092 | 1995 | 25,062 | 1994 | 25,015 | 1993 | 25,007 | 1992 | 25,108 | 1991 | 25,293 | 1990 | 25,514 | 1989 | 25,806 | 1988 | 26,151 | 1987 | 26,513 | 1986 | 26,866 | 1985 | 27,223 | 1984 | 27,587 | 1983 | 27,961 | 1982 | 28,351 | 1981 | 28,724 | 1980 | 28,945 | 1979 | 28,999 | 1978 | 28,973 | 1977 | 28,898 | 1976 | 28,789 | 1975 | 28,668 | 1974 | 28,542 | 1973 | 28,427 | 1972 | 28,360 | 1971 | 28,354 | 1970 | 28,271 | 1969 | 28,106 | 1968 | 27,882 | 1967 | 27,440 | 1966 | 26,585 | 1965 | 25,219 | 1964 | 23,482 | 1963 | 21,727 | 1962 | 20,330 | 1961 | 19,656 | 1960 | 19,923 |
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