Year	Measure
1971	40.32738
1972	37.67331
1973	39.33078
1974	33.8846
1975	38.86771
1976	46.29772
1977	53.22252
1978	53.98414
1979	52.81206
1980	53.88752
1981	54.21755
1982	56.59401
1983	55.93936
1984	64.80804
1985	67.83034
1986	70.81382
1987	77.47181
1988	84.43863
1989	91.36066
1990	94.94264
1991	98.44856
1992	101.48959
1993	111.65866
1994	128.83313
1995	152.51537
1996	179.12155
1997	202.05715
1998	231.96084
1999	252.16845
2000	285.28168
2001	324.93254
2002	375.61391
2003	430.86414
2004	481.26562
2005	566.7377
2006	641.5917
2007	724.10405
2008	798.25574
2009	901.25773
2010	1016.59824
2011	1095.83718
2012	1197.64231
2013	1266.45772
2014	1410.91491