| Year | Value | | 2022 | 2,858 | | 2021 | 2,763 | | 2020 | 2,678 | | 2019 | 2,631 | | 2018 | 2,649 | | 2017 | 2,698 | | 2016 | 2,779 | | 2015 | 2,901 | | 2014 | 3,068 | | 2013 | 3,264 | | 2012 | 3,464 | | 2011 | 3,650 | | 2010 | 3,812 | | 2009 | 3,914 | | 2008 | 3,958 | | 2007 | 3,986 | | 2006 | 4,016 | | 2005 | 4,055 | | 2004 | 4,125 | | 2003 | 4,222 | | 2002 | 4,305 | | 2001 | 4,348 | | 2000 | 4,367 | | 1999 | 4,313 | | 1998 | 4,173 | | 1997 | 4,028 | | 1996 | 3,901 | | 1995 | 3,724 | | 1994 | 3,571 | | 1993 | 3,528 | | 1992 | 3,559 | | 1991 | 3,690 | | 1990 | 3,914 | | 1989 | 4,107 | | 1988 | 4,463 | | 1987 | 4,822 | | 1986 | 5,143 | | 1985 | 5,441 | | 1984 | 5,687 | | 1983 | 5,865 | | 1982 | 5,933 | | 1981 | 5,803 | | 1980 | 5,464 | | 1979 | 4,896 | | 1978 | 4,568 | | 1977 | 4,264 | | 1976 | 4,366 | | 1975 | 4,293 | | 1974 | 4,024 | | 1973 | 3,669 | | 1972 | 3,268 | | 1971 | 3,020 | | 1970 | 2,715 | | 1969 | 2,597 | | 1968 | 2,403 | | 1967 | 2,087 | | 1966 | 1,876 | | 1965 | 1,617 | | 1964 | 1,397 | | 1963 | 1,306 | | 1962 | 1,104 | | 1961 | 1,049 | | 1960 | 1,214 |
|