Year | Value | 2022 | 13,507 | 2021 | 15,577 | 2020 | 17,509 | 2019 | 19,385 | 2018 | 20,869 | 2017 | 21,682 | 2016 | 21,837 | 2015 | 22,240 | 2014 | 22,992 | 2013 | 23,296 | 2012 | 23,277 | 2011 | 23,006 | 2010 | 22,663 | 2009 | 22,586 | 2008 | 22,889 | 2007 | 23,184 | 2006 | 23,082 | 2005 | 22,534 | 2004 | 21,731 | 2003 | 21,017 | 2002 | 20,537 | 2001 | 20,294 | 2000 | 20,188 | 1999 | 19,999 | 1998 | 19,466 | 1997 | 18,429 | 1996 | 17,290 | 1995 | 16,323 | 1994 | 15,935 | 1993 | 16,270 | 1992 | 17,247 | 1991 | 18,483 | 1990 | 19,399 | 1989 | 19,633 | 1988 | 19,205 | 1987 | 18,350 | 1986 | 17,374 | 1985 | 16,627 | 1984 | 16,155 | 1983 | 15,830 | 1982 | 15,575 | 1981 | 15,327 | 1980 | 15,057 | 1979 | 14,705 | 1978 | 14,221 | 1977 | 13,582 | 1976 | 12,848 | 1975 | 12,119 | 1974 | 11,459 | 1973 | 10,879 | 1972 | 10,388 | 1971 | 9,959 | 1970 | 9,557 | 1969 | 9,181 | 1968 | 8,873 | 1967 | 8,644 | 1966 | 8,458 | 1965 | 8,273 | 1964 | 8,085 | 1963 | 7,899 | 1962 | 7,724 | 1961 | 7,561 | 1960 | 7,435 |
|