Year | Value | 2022 | 17,679 | 2021 | 17,344 | 2020 | 17,199 | 2019 | 17,158 | 2018 | 17,041 | 2017 | 16,997 | 2016 | 17,004 | 2015 | 16,882 | 2014 | 16,653 | 2013 | 16,556 | 2012 | 16,314 | 2011 | 15,843 | 2010 | 15,395 | 2009 | 15,125 | 2008 | 14,820 | 2007 | 14,468 | 2006 | 14,138 | 2005 | 13,737 | 2004 | 13,368 | 2003 | 13,061 | 2002 | 12,800 | 2001 | 12,714 | 2000 | 12,467 | 1999 | 12,144 | 1998 | 12,007 | 1997 | 11,859 | 1996 | 11,609 | 1995 | 11,388 | 1994 | 11,220 | 1993 | 11,076 | 1992 | 11,062 | 1991 | 11,225 | 1990 | 11,454 | 1989 | 11,741 | 1988 | 12,131 | 1987 | 12,551 | 1986 | 12,887 | 1985 | 13,206 | 1984 | 13,605 | 1983 | 13,958 | 1982 | 14,148 | 1981 | 14,178 | 1980 | 14,177 | 1979 | 14,175 | 1978 | 14,173 | 1977 | 14,190 | 1976 | 14,147 | 1975 | 13,980 | 1974 | 13,764 | 1973 | 13,590 | 1972 | 13,324 | 1971 | 12,835 | 1970 | 12,360 | 1969 | 11,921 | 1968 | 11,557 | 1967 | 11,388 | 1966 | 11,334 | 1965 | 11,175 | 1964 | 10,877 | 1963 | 10,620 | 1962 | 10,425 | 1961 | 10,164 | 1960 | 10,146 |
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