Year | Value | 2022 | 28,300 | 2021 | 25,789 | 2020 | 23,690 | 2019 | 22,143 | 2018 | 20,575 | 2017 | 19,291 | 2016 | 18,409 | 2015 | 17,713 | 2014 | 17,153 | 2013 | 17,006 | 2012 | 17,116 | 2011 | 17,499 | 2010 | 18,017 | 2009 | 18,542 | 2008 | 18,858 | 2007 | 18,823 | 2006 | 18,421 | 2005 | 17,709 | 2004 | 16,986 | 2003 | 16,583 | 2002 | 16,420 | 2001 | 16,284 | 2000 | 16,100 | 1999 | 15,837 | 1998 | 15,389 | 1997 | 14,797 | 1996 | 14,251 | 1995 | 13,848 | 1994 | 13,666 | 1993 | 13,717 | 1992 | 13,933 | 1991 | 14,184 | 1990 | 14,359 | 1989 | 14,437 | 1988 | 14,371 | 1987 | 14,154 | 1986 | 13,875 | 1985 | 13,593 | 1984 | 13,374 | 1983 | 13,351 | 1982 | 13,536 | 1981 | 13,830 | 1980 | 14,144 | 1979 | 14,386 | 1978 | 14,417 | 1977 | 14,265 | 1976 | 14,074 | 1975 | 13,896 | 1974 | 13,785 | 1973 | 13,792 | 1972 | 13,955 | 1971 | 14,302 | 1970 | 14,816 | 1969 | 15,356 | 1968 | 15,422 | 1967 | 14,958 | 1966 | 14,370 | 1965 | 13,828 | 1964 | 13,522 | 1963 | 13,492 | 1962 | 13,114 | 1961 | 12,268 | 1960 | 11,368 |
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