Year Measure 1985 1624.5933 1986 1703.18407 1987 1746.24252 1988 1810.52957 1989 1675.21373 1990 1560.47973 1991 1720.31879 1992 1488.64008 1993 1380.19265 1994 1184.47741 1995 1172.64328 1996 979.81884 1997 951.85116 1998 951.34595 1999 944.39268 2000 999.64629 2001 997.92088 2002 1058.0973 2003 1022.72074 2004 1041.5122 2005 1185.67149 2006 1332.3233 2007 1377.57623 2008 1363.62837 2009 1395.33499 2010 1453.34341 2011 1562.00543 2012 1695.90324 2013 1833.07872 2014 1838.23946