| Year | Value | | 2022 | 5,390 | | 2021 | 5,136 | | 2020 | 4,832 | | 2019 | 4,497 | | 2018 | 4,158 | | 2017 | 3,852 | | 2016 | 3,603 | | 2015 | 3,420 | | 2014 | 3,311 | | 2013 | 3,257 | | 2012 | 3,234 | | 2011 | 3,227 | | 2010 | 3,225 | | 2009 | 3,218 | | 2008 | 3,221 | | 2007 | 3,237 | | 2006 | 3,266 | | 2005 | 3,322 | | 2004 | 3,393 | | 2003 | 3,462 | | 2002 | 3,531 | | 2001 | 3,587 | | 2000 | 3,641 | | 1999 | 3,688 | | 1998 | 3,700 | | 1997 | 3,673 | | 1996 | 3,606 | | 1995 | 3,497 | | 1994 | 3,362 | | 1993 | 3,217 | | 1992 | 3,063 | | 1991 | 2,898 | | 1990 | 2,731 | | 1989 | 2,573 | | 1988 | 2,436 | | 1987 | 2,321 | | 1986 | 2,231 | | 1985 | 2,157 | | 1984 | 2,085 | | 1983 | 2,011 | | 1982 | 1,942 | | 1981 | 1,884 | | 1980 | 1,848 | | 1979 | 1,838 | | 1978 | 1,838 | | 1977 | 1,845 | | 1976 | 1,859 | | 1975 | 1,881 | | 1974 | 1,918 | | 1973 | 1,971 | | 1972 | 2,031 | | 1971 | 2,092 | | 1970 | 2,157 | | 1969 | 2,229 | | 1968 | 2,286 | | 1967 | 2,318 | | 1966 | 2,333 | | 1965 | 2,329 | | 1964 | 2,318 | | 1963 | 2,306 | | 1962 | 2,294 | | 1961 | 2,280 | | 1960 | 2,264 |
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