Year	Measure
1971	1495.16339
1972	1405.32363
1973	1508.76409
1974	1735.05877
1975	1724.23377
1976	1738.97395
1977	1809.81997
1978	1899.94555
1979	1914.59916
1980	2128.87225
1981	2221.63758
1982	2155.27354
1983	2262.82007
1984	2151.23124
1985	2075.45782
1986	2115.75429
1987	2063.81024
1988	1942.96193
1989	1946.64572
1990	1993.133
1991	2033.66783
1992	2223.7099
1993	2025.74066
1994	2298.02868
1995	2110.94745
1996	2204.17378
1997	2150.67102
1998	2220.39827
1999	2076.402
2000	2093.75437
2001	2126.76293
2002	2266.51576
2003	2047.27251
2004	2142.99806
2005	2102.16665
2006	2302.79354
2007	2095.11142
2008	2305.69645
2009	2274.51287
2010	2493.4664
2011	2280.72791
2012	2444.10422
2013	2268.05596