Year | Value | 2022 | 54,943 | 2021 | 48,948 | 2020 | 41,549 | 2019 | 33,497 | 2018 | 26,170 | 2017 | 21,370 | 2016 | 20,299 | 2015 | 23,517 | 2014 | 30,127 | 2013 | 37,835 | 2012 | 44,112 | 2011 | 47,742 | 2010 | 48,768 | 2009 | 47,457 | 2008 | 45,053 | 2007 | 43,122 | 2006 | 41,989 | 2005 | 42,246 | 2004 | 44,335 | 2003 | 47,040 | 2002 | 49,131 | 2001 | 50,163 | 2000 | 49,945 | 1999 | 48,456 | 1998 | 45,964 | 1997 | 42,974 | 1996 | 40,133 | 1995 | 37,766 | 1994 | 35,860 | 1993 | 34,803 | 1992 | 34,242 | 1991 | 33,520 | 1990 | 33,216 | 1989 | 33,231 | 1988 | 33,510 | 1987 | 34,706 | 1986 | 36,245 | 1985 | 37,091 | 1984 | 36,840 | 1983 | 35,800 | 1982 | 34,436 | 1981 | 33,256 | 1980 | 32,758 | 1979 | 32,873 | 1978 | 33,558 | 1977 | 34,600 | 1976 | 35,166 | 1975 | 34,808 | 1974 | 33,606 | 1973 | 31,625 | 1972 | 29,146 | 1971 | 26,749 | 1970 | 24,869 | 1969 | 23,369 | 1968 | 22,088 | 1967 | 21,176 | 1966 | 20,606 | 1965 | 20,346 | 1964 | 20,532 | 1963 | 21,178 | 1962 | 22,137 | 1961 | 23,044 | 1960 | 23,520 |
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