Year | Value | 2021 | 49,170 | 2020 | 49,160 | 2019 | 49,182 | 2018 | 49,116 | 2017 | 49,071 | 2016 | 48,754 | 2015 | 48,438 | 2014 | 48,122 | 2013 | 47,806 | 2012 | 47,490 | 2011 | 47,528 | 2010 | 47,557 | 2009 | 47,594 | 2008 | 47,270 | 2007 | 47,290 | 2006 | 47,350 | 2005 | 46,720 | 2004 | 46,500 | 2003 | 45,960 | 2002 | 45,710 | 2001 | 45,730 | 2000 | 45,730 | 1999 | 45,680 | 1998 | 45,470 | 1997 | 45,620 | 1996 | 45,850 | 1995 | 45,820 | 1994 | 44,700 | 1993 | 45,430 | 1992 | 44,890 | 1991 | 44,890 | 1990 | 44,890 | 1989 | 44,890 | 1988 | 44,890 | 1987 | 44,890 | 1986 | 44,890 | 1985 | 44,890 | 1984 | 44,890 | 1983 | 44,890 | 1982 | 44,890 | 1981 | 44,890 | 1980 | 44,890 | 1979 | 44,890 | 1978 | 44,890 | 1977 | 44,890 | 1976 | 44,890 | 1975 | 44,890 | 1974 | 44,890 | 1973 | 44,890 | 1972 | 44,890 | 1971 | 44,890 | 1970 | 44,890 | 1969 | 44,890 | 1968 | 44,890 | 1967 | 44,890 | 1966 | 44,890 | 1965 | 44,890 | 1964 | 44,890 | 1963 | 44,890 | 1962 | 44,890 | 1961 | 44,890 |
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