| Year | Value | | 2023 | 64,010 | | 2022 | 64,010 | | 2021 | 64,010 | | 2020 | 64,010 | | 2019 | 64,010 | | 2018 | 63,000 | | 2017 | 63,000 | | 2016 | 62,267 | | 2015 | 62,403 | | 2014 | 62,788.8 | | 2013 | 63,423 | | 2012 | 64,056 | | 2011 | 64,078 | | 2010 | 64,612 | | 2009 | 65,138 | | 2008 | 65,670 | | 2007 | 66,200 | | 2006 | 66,300 | | 2005 | 66,370 | | 2004 | 65,280 | | 2003 | 66,380 | | 2002 | 66,540 | | 2001 | 66,560 | | 2000 | 65,540 | | 1999 | 66,600 | | 1998 | 66,740 | | 1997 | 66,870 | | 1996 | 66,150 | | 1995 | 66,840 | | 1994 | 66,860 | | 1993 | 67,300 | | 1992 | 67,750 | | 1991 | 67,550 | | 1990 | 67,410 | | 1989 | 67,720 | | 1988 | 67,880 | | 1987 | 67,260 | | 1986 | 64,510 | | 1985 | 62,220 | | 1984 | 61,420 | | 1983 | 61,790 | | 1982 | 60,830 | | 1981 | 59,380 | | 1980 | 59,370 | | 1979 | 58,620 | | 1978 | 59,480 | | 1977 | 60,380 | | 1976 | 59,970 |
|