| Year | Value | | 2021 | 29,123,643.288 | | 2020 | 29,113,610.684 | | 2019 | 29,066,954.57 | | 2018 | 29,087,068.696 | | 2017 | 29,085,385.636 | | 2016 | 29,079,868.329 | | 2015 | 29,077,452.967 | | 2014 | 29,040,525.552 | | 2013 | 29,077,250.123 | | 2012 | 29,053,717.746 | | 2011 | 29,041,922.879 | | 2010 | 29,041,304.113 | | 2009 | 28,951,995.125 | | 2008 | 28,950,256.947 | | 2007 | 29,003,716.15 | | 2006 | 28,973,458.545 | | 2005 | 28,954,050.427 | | 2004 | 29,098,880.755 | | 2003 | 29,072,940.664 | | 2002 | 29,214,347.395 | | 2001 | 29,193,718.831 | | 2000 | 29,192,113.432 | | 1999 | 29,174,198.582 | | 1998 | 29,125,238.542 | | 1997 | 29,100,818.922 | | 1996 | 28,944,938.925 | | 1995 | 28,934,649.827 | | 1994 | 28,959,179.376 | | 1993 | 28,904,565.033 | | 1992 | 28,904,084.785 | | 1991 | 28,872,261.918 | | 1990 | 28,801,698.791 | | 1989 | 28,713,881.564 | | 1988 | 28,613,916.936 | | 1987 | 28,534,954.309 | | 1986 | 28,402,240.482 | | 1985 | 28,320,863.825 | | 1984 | 28,110,653.827 | | 1983 | 27,921,348.6 | | 1982 | 27,775,944.873 | | 1981 | 27,623,050.245 | | 1980 | 27,563,586.198 | | 1979 | 27,458,400.991 | | 1978 | 27,339,487.664 | | 1977 | 27,187,120.503 | | 1976 | 27,042,154.742 | | 1975 | 27,065,125.382 | | 1974 | 26,960,626.455 | | 1973 | 26,837,870.427 | | 1972 | 26,708,750.6 | | 1971 | 26,570,280.1 | | 1970 | 26,445,968.4 | | 1969 | 26,332,423.7 | | 1968 | 26,262,618.3 | | 1967 | 26,172,963.1 | | 1966 | 26,095,828.6 | | 1965 | 26,009,382.7 | | 1964 | 25,917,570.5 | | 1963 | 25,837,700 | | 1962 | 25,757,611.8 | | 1961 | 25,678,049.7 |
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