Year Measure 1971 1154.81092 1972 1371.02769 1973 1599.17921 1974 1634.22728 1975 1728.10042 1976 1884.62042 1977 2073.71092 1978 2368.28688 1979 2529.47346 1980 2718.37179 1981 2778.7045 1982 2814.31917 1983 3045.8091 1984 3255.59316 1985 3444.13308 1986 3693.60493 1987 4088.59917 1988 4398.98978 1989 4639.18774 1990 4983.04635 1991 5104.80903 1992 5236.63926 1993 5499.97269 1994 5842.56202 1995 6069.21935 1996 6312.68552 1997 6829.22563 1998 6965.75409 1999 7187.67138 2000 7575.43595 2001 7516.1696 2002 7756.31892 2003 8113.58731 2004 8314.32532 2005 8678.16817 2006 8720.02208 2007 8706.57907 2008 8401.0484 2009 8114.36745 2010 8679.99335 2011 8651.75528 2012 8673.98522 2013 8680.60636 2014 8844.68759