Year | Value | 2023 | 56,441 | 2022 | 56,410 | 2021 | 56,378 | 2020 | 56,370 | 2019 | 56,429 | 2018 | 56,513 | 2017 | 56,590 | 2016 | 56,691 | 2015 | 56,822 | 2014 | 56,939 | 2013 | 57,039 | 2012 | 57,190 | 2011 | 57,422 | 2010 | 57,730 | 2009 | 58,112 | 2008 | 58,642 | 2007 | 59,191 | 2006 | 59,450 | 2005 | 59,389 | 2004 | 58,990 | 2003 | 58,117 | 2002 | 56,737 | 2001 | 55,180 | 2000 | 53,848 | 1999 | 52,797 | 1998 | 51,945 | 1997 | 51,225 | 1996 | 50,668 | 1995 | 50,308 | 1994 | 50,446 | 1993 | 49,937 | 1992 | 51,331 | 1991 | 52,098 | 1990 | 48,115 | 1989 | 43,703 | 1988 | 40,709 | 1987 | 38,410 | 1986 | 36,259 | 1985 | 34,474 | 1984 | 33,117 | 1983 | 32,119 | 1982 | 31,285 | 1981 | 30,346 | 1980 | 29,081 | 1979 | 27,410 | 1978 | 25,405 | 1977 | 23,264 | 1976 | 21,216 | 1975 | 19,400 | 1974 | 17,868 |
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