| Year | Value | | 2014 | 8,355.8419518213 | | 2013 | 8,509.611580336 | | 2012 | 8,548.8821992811 | | 2011 | 8,425.167753204 | | 2010 | 8,382.7111544534 | | 2009 | 7,944.7960962317 | | 2008 | 8,233.0148329099 | | 2007 | 8,207.4747389755 | | 2006 | 8,244.4019519048 | | 2005 | 7,977.6815974177 | | 2004 | 7,808.1577921396 | | 2003 | 7,695.0800370822 | | 2002 | 7,427.6564450912 | | 2001 | 7,333.2319526284 | | 2000 | 7,076.2694833944 | | 1999 | 6,972.1898161286 | | 1998 | 6,706.7086768874 | | 1997 | 6,620.4478616513 | | 1996 | 6,607.2229774104 | | 1995 | 6,344.3930874084 | | 1994 | 6,205.8049036065 | | 1993 | 6,137.269463432 | | 1992 | 6,227.4980489647 | | 1991 | 6,347.2200963237 | | 1990 | 6,111.4765201196 | | 1989 | 5,896.1355678085 | | 1988 | 5,716.8342470064 | | 1987 | 5,536.1441536211 | | 1986 | 5,321.4129737216 | | 1985 | 5,280.7771595053 | | 1984 | 5,070.995792597 | | 1983 | 4,827.4840615665 | | 1982 | 4,730.5700713216 | | 1981 | 4,697.3658655174 | | 1980 | 4,684.4577599404 | | 1979 | 4,541.5379316968 | | 1978 | 4,335.0539286633 | | 1977 | 4,137.7141626467 | | 1976 | 4,068.190905456 | | 1975 | 3,734.4454731773 | | 1974 | 3,769.0297113924 | | 1973 | 3,620.5620399902 | | 1972 | 3,404.469207541 | | 1971 | 3,213.126836382 | | 1970 | 3,019.1161585657 | | 1969 | 2,814.6546423861 | | 1968 | 2,608.6242379544 | | 1967 | 2,448.6925440403 | | 1966 | 2,375.0127354766 | | 1965 | 2,305.3577079777 | | 1964 | 2,232.8965042088 | | 1963 | 2,124.3591839306 | | 1962 | 2,006.7703956205 | | 1961 | 1,882.2237108539 | | 1960 | 1,814.6760166918 |
|