Year | Value | 2022 | 51,554 | 2021 | 52,773 | 2020 | 53,687 | 2019 | 54,144 | 2018 | 54,207 | 2017 | 53,970 | 2016 | 53,471 | 2015 | 52,749 | 2014 | 51,846 | 2013 | 50,797 | 2012 | 49,622 | 2011 | 48,316 | 2010 | 46,815 | 2009 | 45,223 | 2008 | 43,708 | 2007 | 42,288 | 2006 | 40,985 | 2005 | 39,810 | 2004 | 38,740 | 2003 | 37,735 | 2002 | 36,791 | 2001 | 36,083 | 2000 | 35,643 | 1999 | 35,248 | 1998 | 34,821 | 1997 | 34,393 | 1996 | 33,999 | 1995 | 33,638 | 1994 | 33,264 | 1993 | 32,800 | 1992 | 32,296 | 1991 | 31,789 | 1990 | 31,168 | 1989 | 30,417 | 1988 | 29,616 | 1987 | 28,888 | 1986 | 28,315 | 1985 | 27,902 | 1984 | 27,599 | 1983 | 27,322 | 1982 | 26,951 | 1981 | 26,418 | 1980 | 25,806 | 1979 | 25,196 | 1978 | 24,557 | 1977 | 23,779 | 1976 | 22,784 | 1975 | 21,818 | 1974 | 21,136 | 1973 | 20,496 | 1972 | 20,030 | 1971 | 19,996 | 1970 | 20,159 | 1969 | 20,318 | 1968 | 20,366 | 1967 | 20,287 | 1966 | 20,156 | 1965 | 20,124 | 1964 | 20,282 | 1963 | 20,575 | 1962 | 20,854 | 1961 | 20,911 | 1960 | 20,511 |
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