| Year | Value | | 2022 | 5,412 | | 2021 | 5,527 | | 2020 | 5,613 | | 2019 | 5,675 | | 2018 | 5,706 | | 2017 | 5,703 | | 2016 | 5,668 | | 2015 | 5,599 | | 2014 | 5,492 | | 2013 | 5,358 | | 2012 | 5,211 | | 2011 | 5,053 | | 2010 | 4,890 | | 2009 | 4,739 | | 2008 | 4,602 | | 2007 | 4,485 | | 2006 | 4,395 | | 2005 | 4,328 | | 2004 | 4,282 | | 2003 | 4,235 | | 2002 | 4,156 | | 2001 | 4,029 | | 2000 | 3,849 | | 1999 | 3,643 | | 1998 | 3,430 | | 1997 | 3,217 | | 1996 | 3,038 | | 1995 | 2,923 | | 1994 | 2,852 | | 1993 | 2,791 | | 1992 | 2,736 | | 1991 | 2,668 | | 1990 | 2,570 | | 1989 | 2,458 | | 1988 | 2,363 | | 1987 | 2,291 | | 1986 | 2,234 | | 1985 | 2,197 | | 1984 | 2,177 | | 1983 | 2,171 | | 1982 | 2,192 | | 1981 | 2,235 | | 1980 | 2,276 | | 1979 | 2,323 | | 1978 | 2,314 | | 1977 | 2,223 | | 1976 | 2,108 | | 1975 | 1,986 | | 1974 | 1,861 | | 1973 | 1,736 | | 1972 | 1,610 | | 1971 | 1,489 | | 1970 | 1,402 | | 1969 | 1,400 | | 1968 | 1,459 | | 1967 | 1,518 | | 1966 | 1,559 | | 1965 | 1,571 | | 1964 | 1,552 | | 1963 | 1,511 | | 1962 | 1,456 | | 1961 | 1,394 | | 1960 | 1,336 |
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