Year | Value | 2022 | 64,958 | 2021 | 61,462 | 2020 | 57,362 | 2019 | 52,270 | 2018 | 47,695 | 2017 | 43,566 | 2016 | 39,673 | 2015 | 36,459 | 2014 | 33,955 | 2013 | 31,653 | 2012 | 29,752 | 2011 | 28,081 | 2010 | 26,740 | 2009 | 25,695 | 2008 | 24,958 | 2007 | 24,659 | 2006 | 24,777 | 2005 | 25,106 | 2004 | 25,315 | 2003 | 25,146 | 2002 | 24,619 | 2001 | 23,833 | 2000 | 22,888 | 1999 | 22,273 | 1998 | 22,316 | 1997 | 22,686 | 1996 | 23,060 | 1995 | 23,251 | 1994 | 23,030 | 1993 | 22,320 | 1992 | 21,316 | 1991 | 20,310 | 1990 | 19,574 | 1989 | 19,218 | 1988 | 19,155 | 1987 | 19,365 | 1986 | 19,727 | 1985 | 20,039 | 1984 | 20,266 | 1983 | 20,331 | 1982 | 20,192 | 1981 | 20,020 | 1980 | 19,947 | 1979 | 20,019 | 1978 | 20,166 | 1977 | 20,307 | 1976 | 20,489 | 1975 | 20,736 | 1974 | 21,002 | 1973 | 21,216 | 1972 | 21,351 | 1971 | 21,327 | 1970 | 21,096 | 1969 | 20,721 | 1968 | 20,215 | 1967 | 19,857 | 1966 | 19,853 | 1965 | 19,890 | 1964 | 19,666 | 1963 | 19,129 | 1962 | 18,356 | 1961 | 17,632 | 1960 | 17,137 |
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