Year | Value | 2022 | 14,769 | 2021 | 14,713 | 2020 | 14,694 | 2019 | 14,695 | 2018 | 14,699 | 2017 | 14,705 | 2016 | 14,714 | 2015 | 14,732 | 2014 | 14,760 | 2013 | 14,791 | 2012 | 14,825 | 2011 | 14,837 | 2010 | 14,848 | 2009 | 14,878 | 2008 | 14,903 | 2007 | 14,924 | 2006 | 14,946 | 2005 | 14,965 | 2004 | 14,985 | 2003 | 15,003 | 2002 | 15,015 | 2001 | 14,991 | 2000 | 14,901 | 1999 | 14,777 | 1998 | 14,663 | 1997 | 14,554 | 1996 | 14,449 | 1995 | 14,346 | 1994 | 14,240 | 1993 | 14,131 | 1992 | 14,022 | 1991 | 13,976 | 1990 | 14,064 | 1989 | 14,239 | 1988 | 14,405 | 1987 | 14,561 | 1986 | 14,710 | 1985 | 14,853 | 1984 | 14,990 | 1983 | 15,122 | 1982 | 15,246 | 1981 | 15,357 | 1980 | 15,464 | 1979 | 15,469 | 1978 | 15,458 | 1977 | 15,429 | 1976 | 15,399 | 1975 | 15,373 | 1974 | 15,353 | 1973 | 15,340 | 1972 | 15,321 | 1971 | 15,300 | 1970 | 15,353 | 1969 | 15,486 | 1968 | 15,706 | 1967 | 15,863 | 1966 | 15,976 | 1965 | 16,050 | 1964 | 16,081 | 1963 | 16,070 | 1962 | 16,013 | 1961 | 15,900 | 1960 | 15,663 |
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