Year	Measure
1971	339.45104
1972	348.93197
1973	359.86696
1974	367.87791
1975	372.24174
1976	365.39594
1977	381.51511
1978	374.54994
1979	370.53517
1980	372.47413
1981	378.63362
1982	376.70909
1983	308.65914
1984	318.74313
1985	342.25566
1986	345.3601
1987	363.82444
1988	346.4338
1989	363.56877
1990	361.69941
1991	364.0474
1992	366.70451
1993	373.77872
1994	378.60399
1995	386.10404
1996	389.55904
1997	397.3222
1998	409.9972
1999	415.65019
2000	331.40318
2001	325.2379
2002	315.11321
2003	290.54274
2004	282.90419
2005	273.19648
2006	283.53365
2007	276.22694
2008	269.14876
2009	284.11613
2010	302.17455
2011	314.72682
2012	332.52764
2013	339.80615
2014	335.05053