Year	Measure
1971	10.68879
1972	10.50335
1973	15.16934
1974	16.8564
1975	16.98316
1976	17.27418
1977	18.24469
1978	21.43214
1979	20.96249
1980	18.68153
1981	22.30019
1982	25.20715
1983	28.71916
1984	31.59843
1985	32.6288
1986	36.92198
1987	38.32473
1988	41.33683
1989	49.17025
1990	48.36675
1991	48.96648
1992	58.6485
1993	65.20947
1994	68.96922
1995	75.90125
1996	79.49228
1997	81.24847
1998	86.16983
1999	94.27288
2000	101.48863
2001	111.69426
2002	119.27467
2003	125.45767
2004	160.25336
2005	170.68125
2006	190.91546
2007	199.83119
2008	201.24886
2009	219.24206
2010	239.83053
2011	257.63437
2012	274.87196
2013	292.75003
2014	310.39123