| Year | Value | | 2022 | 5,107 | | 2021 | 5,155 | | 2020 | 5,192 | | 2019 | 5,220 | | 2018 | 5,238 | | 2017 | 5,247 | | 2016 | 5,249 | | 2015 | 5,246 | | 2014 | 5,334 | | 2013 | 5,496 | | 2012 | 5,634 | | 2011 | 5,775 | | 2010 | 5,946 | | 2009 | 6,045 | | 2008 | 6,080 | | 2007 | 6,176 | | 2006 | 6,324 | | 2005 | 6,538 | | 2004 | 6,855 | | 2003 | 7,219 | | 2002 | 7,560 | | 2001 | 7,865 | | 2000 | 8,065 | | 1999 | 8,127 | | 1998 | 8,191 | | 1997 | 8,355 | | 1996 | 8,578 | | 1995 | 8,828 | | 1994 | 9,076 | | 1993 | 9,308 | | 1992 | 9,507 | | 1991 | 9,651 | | 1990 | 9,764 | | 1989 | 9,876 | | 1988 | 9,973 | | 1987 | 10,054 | | 1986 | 10,120 | | 1985 | 10,170 | | 1984 | 10,206 | | 1983 | 10,229 | | 1982 | 10,228 | | 1981 | 10,197 | | 1980 | 10,117 | | 1979 | 9,941 | | 1978 | 9,704 | | 1977 | 9,478 | | 1976 | 9,278 | | 1975 | 9,095 | | 1974 | 8,995 | | 1973 | 8,989 | | 1972 | 9,017 | | 1971 | 9,073 | | 1970 | 9,143 | | 1969 | 9,193 | | 1968 | 9,219 | | 1967 | 9,242 | | 1966 | 9,262 | | 1965 | 9,283 | | 1964 | 9,287 | | 1963 | 9,249 | | 1962 | 9,149 | | 1961 | 8,977 | | 1960 | 8,731 |
|