Year	Measure
1971	1310.88048
1972	1325.18809
1973	1320.44228
1974	1348.71664
1975	1367.70898
1976	1427.66165
1977	1482.91027
1978	1572.12622
1979	1660.56235
1980	1737.78232
1981	1758.34587
1982	1808.82884
1983	1846.06716
1984	1861.57107
1985	1907.01299
1986	1848.50039
1987	1755.23742
1988	1762.39089
1989	1730.63969
1990	1637.11386
1991	1538.33448
1992	1323.61123
1993	1198.58191
1994	1080.20481
1995	1005.61057
1996	874.1599
1997	824.46268
1998	762.48994
1999	809.81423
2000	859.90804
2001	880.58176
2002	838.4032
2003	850.8964
2004	863.7916
2005	892.5579
2006	895.62213
2007	756.3434
2008	828.8782
2009	814.23341
2010	768.79088
2011	566.22337
2012	573.55389
2013	434.17107
2014	474.23908