Year	Measure
1971	14.34847
1972	15.89301
1973	15.81587
1974	19.1817
1975	21.4421
1976	18.3269
1977	21.72265
1978	31.749
1979	38.67313
1980	46.15895
1981	52.2656
1982	61.41499
1983	66.08272
1984	71.43052
1985	79.74562
1986	92.04165
1987	104.33886
1988	119.51937
1989	137.49401
1990	162.50285
1991	177.93151
1992	194.30559
1993	212.8201
1994	240.01101
1995	263.58939
1996	297.18155
1997	331.29799
1998	331.12714
1999	357.02549
2000	390.37455
2001	411.3162
2002	417.20753
2003	428.39742
2004	473.67648
2005	499.71609
2006	514.86654
2007	544.71208
2008	568.39605
2009	592.15642
2010	634.17609
2011	678.64429
2012	732.10235
2013	773.29385
2014	811.90018