| Year | Value | | 2022 | 2,249 | | 2021 | 2,414 | | 2020 | 2,580 | | 2019 | 2,698 | | 2018 | 2,771 | | 2017 | 2,837 | | 2016 | 2,901 | | 2015 | 2,956 | | 2014 | 3,006 | | 2013 | 3,055 | | 2012 | 3,094 | | 2011 | 3,119 | | 2010 | 3,155 | | 2009 | 3,161 | | 2008 | 3,113 | | 2007 | 3,050 | | 2006 | 2,987 | | 2005 | 2,940 | | 2004 | 2,990 | | 2003 | 3,117 | | 2002 | 3,230 | | 2001 | 3,328 | | 2000 | 3,390 | | 1999 | 3,375 | | 1998 | 3,291 | | 1997 | 3,179 | | 1996 | 3,063 | | 1995 | 2,958 | | 1994 | 2,914 | | 1993 | 2,934 | | 1992 | 2,984 | | 1991 | 3,056 | | 1990 | 3,126 | | 1989 | 3,185 | | 1988 | 3,231 | | 1987 | 3,259 | | 1986 | 3,273 | | 1985 | 3,270 | | 1984 | 3,249 | | 1983 | 3,214 | | 1982 | 3,177 | | 1981 | 3,149 | | 1980 | 3,130 | | 1979 | 3,113 | | 1978 | 3,092 | | 1977 | 3,071 | | 1976 | 3,050 | | 1975 | 3,034 | | 1974 | 3,033 | | 1973 | 3,056 | | 1972 | 3,103 | | 1971 | 3,196 | | 1970 | 3,333 | | 1969 | 3,493 | | 1968 | 3,667 | | 1967 | 3,843 | | 1966 | 3,987 | | 1965 | 4,092 | | 1964 | 4,173 | | 1963 | 4,222 | | 1962 | 4,248 | | 1961 | 4,264 | | 1960 | 4,263 |
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