Year | Value | 2022 | 31,322 | 2021 | 31,491 | 2020 | 31,517 | 2019 | 31,060 | 2018 | 30,065 | 2017 | 28,766 | 2016 | 27,447 | 2015 | 26,101 | 2014 | 25,038 | 2013 | 24,455 | 2012 | 24,007 | 2011 | 23,436 | 2010 | 22,739 | 2009 | 21,998 | 2008 | 21,330 | 2007 | 20,763 | 2006 | 20,305 | 2005 | 19,877 | 2004 | 19,438 | 2003 | 19,036 | 2002 | 18,629 | 2001 | 18,305 | 2000 | 18,021 | 1999 | 17,676 | 1998 | 17,334 | 1997 | 16,993 | 1996 | 16,639 | 1995 | 16,294 | 1994 | 15,921 | 1993 | 15,478 | 1992 | 15,029 | 1991 | 14,610 | 1990 | 14,229 | 1989 | 13,865 | 1988 | 13,730 | 1987 | 13,949 | 1986 | 14,319 | 1985 | 14,729 | 1984 | 15,178 | 1983 | 15,669 | 1982 | 16,180 | 1981 | 16,667 | 1980 | 17,100 | 1979 | 17,473 | 1978 | 17,784 | 1977 | 18,036 | 1976 | 18,246 | 1975 | 18,220 | 1974 | 17,971 | 1973 | 17,713 | 1972 | 17,457 | 1971 | 17,223 | 1970 | 17,023 | 1969 | 16,859 | 1968 | 16,745 | 1967 | 16,662 | 1966 | 16,544 | 1965 | 16,345 | 1964 | 16,059 | 1963 | 15,673 | 1962 | 15,224 | 1961 | 14,819 | 1960 | 14,525 |
|