Year	Measure
1971	2757.82284
1972	2772.88563
1973	2685.52054
1974	2682.52039
1975	2294.99748
1976	2513.20811
1977	2808.50599
1978	3328.18874
1979	3398.71792
1980	3527.04394
1981	3686.28623
1982	3648.18389
1983	3721.30264
1984	4142.43897
1985	4347.69004
1986	4493.9441
1987	4188.6313
1988	4558.47698
1989	4394.35196
1990	4900.00655
1991	4838.27151
1992	5286.2826
1993	5030.99549
1994	5036.34755
1995	4899.90446
1996	5779.2626
1997	5437.90881
1998	6304.78194
1999	7348.545
2000	7759.75328
2001	8635.7629
2002	9356.80294
2003	10413.69275
2004	10876.63721
2005	12426.38793
2006	13798.83727
2007	14608.00987
2008	14117.1889
2009	14203.1525
2010	15109.18756
2011	14791.36387
2012	14346.84046
2013	14537.4842
2014	14446.74945