Year | Value | 2022 | 39,491 | 2021 | 37,457 | 2020 | 35,433 | 2019 | 33,407 | 2018 | 31,363 | 2017 | 29,328 | 2016 | 27,365 | 2015 | 25,573 | 2014 | 24,015 | 2013 | 22,712 | 2012 | 21,668 | 2011 | 20,848 | 2010 | 20,207 | 2009 | 19,693 | 2008 | 19,285 | 2007 | 18,970 | 2006 | 18,727 | 2005 | 18,537 | 2004 | 18,374 | 2003 | 18,227 | 2002 | 18,075 | 2001 | 17,898 | 2000 | 17,684 | 1999 | 17,441 | 1998 | 17,166 | 1997 | 16,828 | 1996 | 16,422 | 1995 | 15,971 | 1994 | 15,468 | 1993 | 14,911 | 1992 | 14,370 | 1991 | 13,936 | 1990 | 13,689 | 1989 | 13,568 | 1988 | 13,481 | 1987 | 13,425 | 1986 | 13,383 | 1985 | 13,352 | 1984 | 13,330 | 1983 | 13,306 | 1982 | 13,273 | 1981 | 13,227 | 1980 | 13,157 | 1979 | 13,138 | 1978 | 13,133 | 1977 | 13,199 | 1976 | 13,490 | 1975 | 13,971 | 1974 | 14,598 | 1973 | 15,094 | 1972 | 15,372 | 1971 | 15,699 | 1970 | 15,912 | 1969 | 16,023 | 1968 | 16,042 | 1967 | 15,871 | 1966 | 15,803 | 1965 | 15,927 | 1964 | 16,146 | 1963 | 16,186 | 1962 | 15,944 | 1961 | 15,581 | 1960 | 15,211 |
|