Year	Measure
1971	323.71774
1972	357.9978
1973	414.65008
1974	502.03036
1975	533.74055
1976	725.57626
1977	836.04605
1978	1108.7762
1979	1605.62184
1980	1961.17302
1981	2236.01408
1982	2641.09239
1983	2719.01081
1984	3036.21147
1985	3054.10939
1986	3381.71169
1987	3636.25474
1988	3735.67581
1989	3837.53585
1990	3994.83916
1991	4098.74916
1992	4373.13599
1993	4719.49495
1994	4809.43516
1995	4904.45025
1996	4942.1433
1997	5102.18206
1998	5444.19608
1999	5585.08586
2000	5637.55736
2001	5919.09571
2002	6021.46195
2003	6472.56824
2004	6326.0879
2005	6590.28195
2006	6820.48771
2007	6923.85001
2008	7188.99246
2009	7468.33673
2010	7973.51358
2011	8023.54414
2012	8522.89615
2013	8816.31724
2014	9444.21566