Year	Measure
1971	324.80557
1972	324.4067
1973	326.92493
1974	326.91918
1975	326.20496
1976	322.02484
1977	322.69376
1978	322.29265
1979	327.10993
1980	321.20187
1981	328.43583
1982	320.86816
1983	333.49144
1984	341.82617
1985	333.06226
1986	330.83097
1987	335.05688
1988	337.64811
1989	335.68926
1990	340.84876
1991	328.90624
1992	322.08447
1993	315.94675
1994	305.74923
1995	308.58323
1996	310.30646
1997	308.12729
1998	308.55834
1999	302.68001
2000	295.40884
2001	297.01284
2002	298.44357
2003	300.21055
2004	302.50057
2005	304.34727
2006	305.86631
2007	306.82633
2008	307.84652
2009	306.7412
2010	307.61335
2011	315.96325
2012	379.14814
2013	385.40022
2014	389.56739