Year | Value | 2022 | 15,138 | 2021 | 15,128 | 2020 | 15,124 | 2019 | 15,155 | 2018 | 15,210 | 2017 | 15,264 | 2016 | 15,298 | 2015 | 15,274 | 2014 | 15,163 | 2013 | 14,968 | 2012 | 14,702 | 2011 | 14,422 | 2010 | 14,177 | 2009 | 13,980 | 2008 | 13,831 | 2007 | 13,723 | 2006 | 13,713 | 2005 | 13,814 | 2004 | 13,969 | 2003 | 14,160 | 2002 | 14,381 | 2001 | 14,515 | 2000 | 14,534 | 1999 | 14,518 | 1998 | 14,461 | 1997 | 14,355 | 1996 | 14,209 | 1995 | 13,978 | 1994 | 13,650 | 1993 | 13,304 | 1992 | 12,974 | 1991 | 12,777 | 1990 | 12,788 | 1989 | 12,897 | 1988 | 12,991 | 1987 | 12,997 | 1986 | 12,945 | 1985 | 12,958 | 1984 | 13,064 | 1983 | 13,227 | 1982 | 13,405 | 1981 | 13,535 | 1980 | 13,610 | 1979 | 13,688 | 1978 | 13,773 | 1977 | 13,852 | 1976 | 13,937 | 1975 | 14,009 | 1974 | 14,043 | 1973 | 14,035 | 1972 | 13,986 | 1971 | 13,916 | 1970 | 13,840 | 1969 | 13,778 | 1968 | 13,740 | 1967 | 13,732 | 1966 | 13,653 | 1965 | 13,477 | 1964 | 13,313 | 1963 | 13,126 | 1962 | 12,892 | 1961 | 12,624 | 1960 | 12,323 |
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