| Year | Value | | 2021 | 25,494,462.671 | | 2020 | 25,493,347.401 | | 2019 | 25,469,095.348 | | 2018 | 25,491,465.083 | | 2017 | 25,509,590.343 | | 2016 | 25,520,889.495 | | 2015 | 25,536,828.945 | | 2014 | 25,522,088.178 | | 2013 | 25,573,334.379 | | 2012 | 25,567,753.073 | | 2011 | 25,572,344.68 | | 2010 | 25,587,433.453 | | 2009 | 25,518,473.762 | | 2008 | 25,532,233.116 | | 2007 | 25,598,224.941 | | 2006 | 25,593,264.319 | | 2005 | 25,587,983.472 | | 2004 | 25,754,370.338 | | 2003 | 25,729,101.403 | | 2002 | 25,884,739.769 | | 2001 | 25,874,472.434 | | 2000 | 25,893,548.1 | | 1999 | 25,883,107.68 | | 1998 | 25,858,143.46 | | 1997 | 25,837,890.04 | | 1996 | 25,701,089.02 | | 1995 | 25,709,074.8 | | 1994 | 25,777,141.78 | | 1993 | 25,750,184.133 | | 1992 | 25,770,784.285 | | 1991 | 25,763,460.818 | | 1990 | 25,708,619.091 | | 1989 | 25,615,301.164 | | 1988 | 25,538,270.936 | | 1987 | 25,465,483.709 | | 1986 | 25,358,703.482 | | 1985 | 25,272,660.825 | | 1984 | 25,088,169.827 | | 1983 | 24,919,717.6 | | 1982 | 24,758,387.873 | | 1981 | 24,634,501.245 | | 1980 | 24,584,310.198 | | 1979 | 24,495,732.991 | | 1978 | 24,377,856.664 | | 1977 | 24,245,259.503 | | 1976 | 24,104,953.742 | | 1975 | 24,125,334.382 | | 1974 | 24,032,526.455 | | 1973 | 23,904,999.427 | | 1972 | 23,786,869.6 | | 1971 | 23,659,459.1 | | 1970 | 23,535,532.4 | | 1969 | 23,440,022.7 | | 1968 | 23,358,677.3 | | 1967 | 23,269,312.1 | | 1966 | 23,195,977.6 | | 1965 | 23,114,901.7 | | 1964 | 23,037,208.5 | | 1963 | 22,974,718 | | 1962 | 22,914,879.8 | | 1961 | 22,843,557.7 |
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