| Year | Value | | 2022 | 2,832 | | 2021 | 2,829 | | 2020 | 2,816 | | 2019 | 2,845 | | 2018 | 2,853 | | 2017 | 2,833 | | 2016 | 2,828 | | 2015 | 2,822 | | 2014 | 2,802 | | 2013 | 2,815 | | 2012 | 2,844 | | 2011 | 2,922 | | 2010 | 3,034 | | 2009 | 3,128 | | 2008 | 3,193 | | 2007 | 3,214 | | 2006 | 3,216 | | 2005 | 3,195 | | 2004 | 3,130 | | 2003 | 3,020 | | 2002 | 2,877 | | 2001 | 2,725 | | 2000 | 2,580 | | 1999 | 2,452 | | 1998 | 2,356 | | 1997 | 2,281 | | 1996 | 2,239 | | 1995 | 2,223 | | 1994 | 2,207 | | 1993 | 2,179 | | 1992 | 2,142 | | 1991 | 2,100 | | 1990 | 2,042 | | 1989 | 1,977 | | 1988 | 1,924 | | 1987 | 1,898 | | 1986 | 1,923 | | 1985 | 1,979 | | 1984 | 2,022 | | 1983 | 2,046 | | 1982 | 2,060 | | 1981 | 2,085 | | 1980 | 2,127 | | 1979 | 2,176 | | 1978 | 2,229 | | 1977 | 2,274 | | 1976 | 2,284 | | 1975 | 2,260 | | 1974 | 2,229 | | 1973 | 2,206 | | 1972 | 2,195 | | 1971 | 2,183 | | 1970 | 2,168 | | 1969 | 2,153 | | 1968 | 2,138 | | 1967 | 2,119 | | 1966 | 2,078 | | 1965 | 2,025 | | 1964 | 1,973 | | 1963 | 1,919 | | 1962 | 1,862 | | 1961 | 1,804 | | 1960 | 1,744 |
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