| Year | Value | | 2014 | 7,520.166024945 | | 2013 | 7,807.0588153851 | | 2012 | 7,886.0943062534 | | 2011 | 7,928.1906698829 | | 2010 | 8,174.4081624464 | | 2009 | 8,021.2236036659 | | 2008 | 8,305.9230419703 | | 2007 | 8,163.2955760055 | | 2006 | 8,360.5761354924 | | 2005 | 8,305.3711015629 | | 2004 | 8,205.8291185277 | | 2003 | 8,195.1208345659 | | 2002 | 8,031.4322256362 | | 2001 | 7,992.2775757297 | | 2000 | 7,845.6345477955 | | 1999 | 7,646.7061618639 | | 1998 | 7,481.4335469151 | | 1997 | 7,341.6123729106 | | 1996 | 7,393.539172918 | | 1995 | 7,283.3801587828 | | 1994 | 7,155.4856840957 | | 1993 | 7,235.0940761127 | | 1992 | 7,430.2975086119 | | 1991 | 7,538.4067419042 | | 1990 | 7,445.292016894 | | 1989 | 7,369.2866702613 | | 1988 | 7,203.8858334701 | | 1987 | 7,163.2147745201 | | 1986 | 6,994.4853449904 | | 1985 | 6,854.3273833856 | | 1984 | 6,601.0386743591 | | 1983 | 6,330.493382458 | | 1982 | 6,189.3424336079 | | 1981 | 6,119.6958046129 | | 1980 | 5,992.3334590835 | | 1979 | 5,779.1373712837 | | 1978 | 5,520.44672987 | | 1977 | 5,324.9599517542 | | 1976 | 5,082.9003837205 | | 1975 | 4,878.8129678454 | | 1974 | 5,027.1193844266 | | 1973 | 5,010.1889114393 | | 1972 | 4,776.2673943085 | | 1971 | 4,615.3482176181 | | 1970 | 4,306.5086071119 | | 1969 | 4,022.7254245862 | | 1968 | 3,852.1921105708 | | 1967 | 3,749.6338737121 | | 1966 | 3,653.4289782261 | | 1965 | 3,586.2888100549 | | 1964 | 3,454.519324511 | | 1963 | 3,351.4527908607 | | 1962 | 3,278.0061770977 | | 1961 | 3,225.9940297673 | | 1960 | 3,075.5503134768 |
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