Year	Measure
1971	57.65682
1972	64.21953
1973	66.48009
1974	67.02718
1975	70.95519
1976	72.57641
1977	74.54493
1978	81.05481
1979	89.12266
1980	94.77345
1981	100.50158
1982	109.85314
1983	115.15374
1984	118.23397
1985	128.12275
1986	136.66237
1987	137.25418
1988	141.15468
1989	138.33439
1990	151.41624
1991	157.64298
1992	166.05943
1993	182.50195
1994	199.63148
1995	215.70526
1996	204.44021
1997	229.75124
1998	249.10207
1999	262.94782
2000	294.75127
2001	290.80444
2002	303.15909
2003	326.40644
2004	354.62571
2005	400.52123
2006	403.60646
2007	420.98273
2008	427.20705
2009	426.1501
2010	461.12671
2011	504.20829
2012	524.30845
2013	525.72261
2014	531.26956