Year	Measure
1971	268.12342
1972	268.08184
1973	269.37777
1974	273.50078
1975	276.70765
1976	281.26765
1977	282.7815
1978	280.21943
1979	286.40982
1980	287.05476
1981	294.67555
1982	299.05247
1983	301.70057
1984	307.10324
1985	315.98307
1986	319.98203
1987	325.02884
1988	335.45032
1989	343.9333
1990	351.34077
1991	358.66187
1992	364.39514
1993	365.83442
1994	372.56455
1995	386.47099
1996	390.80777
1997	398.77052
1998	400.87884
1999	416.37397
2000	418.68428
2001	417.38199
2002	422.62733
2003	425.63279
2004	441.06478
2005	451.13831
2006	467.54576
2007	486.55048
2008	503.03558
2009	546.17673
2010	563.1593
2011	579.40874
2012	600.44323
2013	606.87428
2014	637.42863