Year	Measure
1971	2637.66077
1972	3033.69237
1973	2952.73515
1974	2992.76532
1975	3801.40257
1976	4136.08228
1977	4976.89689
1978	6314.64967
1979	8703.78398
1980	9710.64686
1981	9929.71823
1982	10010.95906
1983	9515.99301
1984	9556.16406
1985	10062.49309
1986	10273.11199
1987	9828.55086
1988	9623.83448
1989	9513.49947
1990	9587.67539
1991	8986.83258
1992	9834.1732
1993	10365.53514
1994	10757.35316
1995	10739.01316
1996	11837.93346
1997	12078.00856
1998	13800.11991
1999	14027.64436
2000	14353.32375
2001	15006.01408
2002	15760.64145
2003	16228.90968
2004	16231.03228
2005	15467.1896
2006	15702.97175
2007	15192.92084
2008	14457.20348
2009	14232.64059
2010	14821.23712
2011	14761.37443
2012	15462.40747
2013	14445.4077
2014	15309.42938