Year Measure 1971 274.1343 1972 315.51859 1973 383.60394 1974 421.29273 1975 458.4707 1976 490.5778 1977 514.29555 1978 511.74987 1979 555.45028 1980 537.90943 1981 557.19346 1982 612.70197 1983 681.8407 1984 716.94798 1985 749.55587 1986 758.73723 1987 807.59831 1988 802.17625 1989 861.01652 1990 943.22601 1991 999.83296 1992 1074.66884 1993 1127.30339 1994 1174.3299 1995 1201.02726 1996 1293.35831 1997 1337.98843 1998 1381.75477 1999 1460.94549 2000 1534.61598 2001 1628.1198 2002 1727.33522 2003 1869.75625 2004 1990.30123 2005 2060.08619 2006 2200.20587 2007 2285.04067 2008 2398.4721 2009 2479.91639 2010 2631.23976 2011 2651.07704 2012 2751.34293 2013 2795.95695 2014 2985.68728