Year | Value | 2022 | 20,338 | 2021 | 20,682 | 2020 | 20,971 | 2019 | 21,133 | 2018 | 21,243 | 2017 | 21,261 | 2016 | 21,165 | 2015 | 21,076 | 2014 | 21,112 | 2013 | 21,087 | 2012 | 20,954 | 2011 | 20,741 | 2010 | 20,534 | 2009 | 20,294 | 2008 | 19,783 | 2007 | 19,169 | 2006 | 18,426 | 2005 | 17,130 | 2004 | 15,626 | 2003 | 14,538 | 2002 | 13,870 | 2001 | 13,733 | 2000 | 14,320 | 1999 | 15,410 | 1998 | 16,484 | 1997 | 17,380 | 1996 | 17,920 | 1995 | 17,979 | 1994 | 17,593 | 1993 | 16,982 | 1992 | 16,366 | 1991 | 16,015 | 1990 | 15,978 | 1989 | 16,077 | 1988 | 16,143 | 1987 | 16,031 | 1986 | 15,649 | 1985 | 15,031 | 1984 | 14,302 | 1983 | 13,580 | 1982 | 12,918 | 1981 | 12,238 | 1980 | 11,364 | 1979 | 10,398 | 1978 | 9,578 | 1977 | 8,995 | 1976 | 8,725 | 1975 | 8,801 | 1974 | 9,141 | 1973 | 9,605 | 1972 | 10,077 | 1971 | 10,490 | 1970 | 10,800 | 1969 | 10,998 | 1968 | 11,090 | 1967 | 11,069 | 1966 | 10,910 | 1965 | 10,622 | 1964 | 10,254 | 1963 | 9,889 | 1962 | 9,609 | 1961 | 9,447 | 1960 | 9,339 |
|