| Year | Value | | 2021 | 15,324,865.094 | | 2020 | 15,340,658.729 | | 2019 | 15,343,718.072 | | 2018 | 15,368,189.576 | | 2017 | 15,375,904.402 | | 2016 | 15,393,026.67 | | 2015 | 15,396,246.72 | | 2014 | 15,388,289.29 | | 2013 | 15,405,823.704 | | 2012 | 15,385,105.473 | | 2011 | 15,383,909.36 | | 2010 | 15,392,297.92 | | 2009 | 15,334,180.652 | | 2008 | 15,329,176.696 | | 2007 | 15,312,661.411 | | 2006 | 15,314,137.667 | | 2005 | 15,310,498.322 | | 2004 | 15,307,784.111 | | 2003 | 15,319,259.4 | | 2002 | 15,471,948.889 | | 2001 | 15,480,197.777 | | 2000 | 15,523,594.267 | | 1999 | 15,516,134.1 | | 1998 | 15,509,609.133 | | 1997 | 15,507,550.167 | | 1996 | 15,377,986.2 | | 1995 | 15,385,653.133 | | 1994 | 15,471,254.067 | | 1993 | 15,453,808 | | 1992 | 15,501,733.933 | | 1991 | 15,508,454.047 | | 1990 | 15,462,378.8 | | 1989 | 15,415,158.733 | | 1988 | 15,364,890.667 | | 1987 | 15,317,644.6 | | 1986 | 15,268,741.333 | | 1985 | 15,219,145.237 | | 1984 | 15,078,292.2 | | 1983 | 14,942,646.733 | | 1982 | 14,811,804.817 | | 1981 | 14,691,880.4 | | 1980 | 14,614,881.163 | | 1979 | 14,510,686.767 | | 1978 | 14,425,875.25 | | 1977 | 14,310,229.9 | | 1976 | 14,186,152.95 | | 1975 | 14,213,151.4 | | 1974 | 14,122,063.7 | | 1973 | 14,007,182.9 | | 1972 | 13,899,656.3 | | 1971 | 13,804,569.8 | | 1970 | 13,696,285.1 | | 1969 | 13,603,781.4 | | 1968 | 13,515,044 | | 1967 | 13,431,314.8 | | 1966 | 13,351,750.3 | | 1965 | 13,269,373.4 | | 1964 | 13,175,798.2 | | 1963 | 13,096,639.7 | | 1962 | 13,013,068.5 | | 1961 | 12,931,009.4 |
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