Year | Value | 2022 | 17,087 | 2021 | 17,469 | 2020 | 17,792 | 2019 | 17,989 | 2018 | 18,119 | 2017 | 18,174 | 2016 | 18,099 | 2015 | 18,166 | 2014 | 18,414 | 2013 | 18,608 | 2012 | 18,745 | 2011 | 18,803 | 2010 | 18,630 | 2009 | 18,411 | 2008 | 18,489 | 2007 | 18,793 | 2006 | 19,200 | 2005 | 19,548 | 2004 | 19,706 | 2003 | 19,768 | 2002 | 19,844 | 2001 | 20,015 | 2000 | 20,256 | 1999 | 20,623 | 1998 | 20,969 | 1997 | 21,303 | 1996 | 21,726 | 1995 | 22,291 | 1994 | 22,944 | 1993 | 23,681 | 1992 | 24,493 | 1991 | 25,063 | 1990 | 25,293 | 1989 | 25,447 | 1988 | 25,588 | 1987 | 25,697 | 1986 | 25,773 | 1985 | 25,938 | 1984 | 26,189 | 1983 | 26,418 | 1982 | 26,632 | 1981 | 26,774 | 1980 | 26,618 | 1979 | 26,288 | 1978 | 26,046 | 1977 | 25,880 | 1976 | 25,749 | 1975 | 25,659 | 1974 | 25,639 | 1973 | 25,718 | 1972 | 25,939 | 1971 | 26,342 | 1970 | 26,852 | 1969 | 27,473 | 1968 | 28,271 | 1967 | 29,185 | 1966 | 30,072 | 1965 | 30,820 | 1964 | 31,386 | 1963 | 31,765 | 1962 | 31,936 | 1961 | 31,908 | 1960 | 31,696 |
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