Year	Measure
1971	30.18691
1972	31.9854
1973	33.56661
1974	33.79144
1975	34.22964
1976	34.86263
1977	34.9049
1978	34.2343
1979	36.66506
1980	36.61052
1981	37.5575
1982	35.54273
1983	33.71553
1984	34.33521
1985	36.03975
1986	40.37982
1987	40.77844
1988	44.37482
1989	46.67369
1990	51.17911
1991	54.2656
1992	52.93976
1993	48.27824
1994	49.19057
1995	57.07462
1996	60.56111
1997	55.03354
1998	59.84276
1999	55.38945
2000	57.93193
2001	61.59407
2002	66.83135
2003	66.65039
2004	77.98696
2005	77.66957
2006	63.61519
2007	79.35843
2008	83.52179
2009	69.85456
2010	92.95295
2011	83.85378
2012	93.75956
2013	95.97802
2014	99.16747