Year	Measure
1971	313.85924
1972	317.8101
1973	320.4128
1974	327.98323
1975	333.51652
1976	346.94368
1977	350.43385
1978	358.03439
1979	364.43443
1980	366.15047
1981	298.00276
1982	301.84759
1983	303.41093
1984	299.24175
1985	294.76606
1986	224.2922
1987	226.3269
1988	229.25763
1989	228.85169
1990	219.79309
1991	215.14619
1992	219.07547
1993	207.65904
1994	187.16178
1995	216.52686
1996	243.99988
1997	252.46319
1998	248.1681
1999	247.10598
2000	235.14469
2001	236.28866
2002	261.37451
2003	247.08329
2004	250.87162
2005	367.69702
2006	372.72597
2007	384.51655
2008	383.51972
2009	383.23453
2010	379.67184
2011	387.37073
2012	395.77917
2013	392.84854
2014	392.80117