Year | Value | 2022 | 60,132 | 2021 | 57,781 | 2020 | 53,960 | 2019 | 49,924 | 2018 | 48,018 | 2017 | 47,292 | 2016 | 47,047 | 2015 | 48,331 | 2014 | 50,035 | 2013 | 49,956 | 2012 | 49,069 | 2011 | 48,570 | 2010 | 48,548 | 2009 | 48,623 | 2008 | 48,828 | 2007 | 49,636 | 2006 | 50,137 | 2005 | 50,781 | 2004 | 51,207 | 2003 | 51,131 | 2002 | 50,812 | 2001 | 50,182 | 2000 | 49,323 | 1999 | 48,439 | 1998 | 47,847 | 1997 | 47,345 | 1996 | 46,492 | 1995 | 44,980 | 1994 | 42,699 | 1993 | 39,136 | 1992 | 34,380 | 1991 | 29,717 | 1990 | 26,339 | 1989 | 25,563 | 1988 | 27,682 | 1987 | 31,522 | 1986 | 35,229 | 1985 | 38,032 | 1984 | 39,433 | 1983 | 39,413 | 1982 | 38,912 | 1981 | 38,584 | 1980 | 38,238 | 1979 | 37,339 | 1978 | 36,423 | 1977 | 35,746 | 1976 | 35,285 | 1975 | 34,977 | 1974 | 34,704 | 1973 | 34,183 | 1972 | 33,290 | 1971 | 31,998 | 1970 | 30,300 | 1969 | 28,718 | 1968 | 27,459 | 1967 | 26,223 | 1966 | 24,928 | 1965 | 23,628 | 1964 | 22,687 | 1963 | 22,253 | 1962 | 22,059 | 1961 | 22,009 | 1960 | 22,104 |
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