Year | Value | 2022 | 31,614 | 2021 | 31,846 | 2020 | 31,830 | 2019 | 31,969 | 2018 | 32,254 | 2017 | 32,701 | 2016 | 33,449 | 2015 | 34,413 | 2014 | 35,408 | 2013 | 36,536 | 2012 | 37,753 | 2011 | 38,943 | 2010 | 40,491 | 2009 | 42,305 | 2008 | 43,977 | 2007 | 45,377 | 2006 | 46,514 | 2005 | 47,311 | 2004 | 47,830 | 2003 | 47,921 | 2002 | 47,748 | 2001 | 47,964 | 2000 | 48,439 | 1999 | 49,020 | 1998 | 50,019 | 1997 | 51,407 | 1996 | 52,210 | 1995 | 52,805 | 1994 | 53,038 | 1993 | 52,263 | 1992 | 51,145 | 1991 | 49,919 | 1990 | 49,099 | 1989 | 48,903 | 1988 | 49,361 | 1987 | 50,387 | 1986 | 51,698 | 1985 | 53,219 | 1984 | 54,731 | 1983 | 55,927 | 1982 | 56,662 | 1981 | 56,437 | 1980 | 55,462 | 1979 | 54,121 | 1978 | 52,773 | 1977 | 51,818 | 1976 | 50,915 | 1975 | 50,401 | 1974 | 50,428 | 1973 | 50,975 | 1972 | 52,078 | 1971 | 53,716 | 1970 | 55,549 | 1969 | 57,293 | 1968 | 58,820 | 1967 | 59,974 | 1966 | 60,643 | 1965 | 60,869 | 1964 | 60,718 | 1963 | 60,176 | 1962 | 59,228 | 1961 | 57,855 | 1960 | 57,434 |
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