Year	Measure
1971	217.47241
1972	234.53774
1973	213.61576
1974	234.03676
1975	249.87479
1976	284.50794
1977	303.54668
1978	305.57589
1979	328.21066
1980	342.29587
1981	389.01299
1982	415.34228
1983	449.10277
1984	485.00106
1985	511.01425
1986	510.65299
1987	529.15055
1988	527.13352
1989	547.43514
1990	561.74281
1991	549.23657
1992	551.54189
1993	560.34878
1994	528.55366
1995	551.33677
1996	574.19542
1997	587.00873
1998	617.5315
1999	619.83482
2000	580.60483
2001	639.94191
2002	647.73773
2003	659.77856
2004	699.93011
2005	800.69828
2006	831.09115
2007	874.79545
2008	892.82105
2009	896.78559
2010	862.51073
2011	886.31327
2012	891.24155
2013	835.37355
2014	814.98806