| Year | Value | | 2022 | 3,948 | | 2021 | 3,886 | | 2020 | 3,794 | | 2019 | 3,687 | | 2018 | 3,576 | | 2017 | 3,463 | | 2016 | 3,355 | | 2015 | 3,252 | | 2014 | 3,156 | | 2013 | 3,062 | | 2012 | 2,965 | | 2011 | 2,872 | | 2010 | 2,776 | | 2009 | 2,667 | | 2008 | 2,552 | | 2007 | 2,438 | | 2006 | 2,337 | | 2005 | 2,263 | | 2004 | 2,223 | | 2003 | 2,211 | | 2002 | 2,217 | | 2001 | 2,227 | | 2000 | 2,236 | | 1999 | 2,244 | | 1998 | 2,244 | | 1997 | 2,236 | | 1996 | 2,215 | | 1995 | 2,183 | | 1994 | 2,144 | | 1993 | 2,105 | | 1992 | 2,076 | | 1991 | 2,060 | | 1990 | 2,055 | | 1989 | 2,054 | | 1988 | 2,040 | | 1987 | 2,006 | | 1986 | 1,995 | | 1985 | 2,018 | | 1984 | 2,027 | | 1983 | 2,009 | | 1982 | 1,967 | | 1981 | 1,922 | | 1980 | 1,886 | | 1979 | 1,846 | | 1978 | 1,789 | | 1977 | 1,719 | | 1976 | 1,639 | | 1975 | 1,559 | | 1974 | 1,488 | | 1973 | 1,420 | | 1972 | 1,355 | | 1971 | 1,290 | | 1970 | 1,228 | | 1969 | 1,174 | | 1968 | 1,129 | | 1967 | 1,095 | | 1966 | 1,065 | | 1965 | 1,040 | | 1964 | 1,029 | | 1963 | 1,033 | | 1962 | 1,044 | | 1961 | 1,045 | | 1960 | 1,036 |
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