Year	Measure
1971	37113.33953
1972	36146.69961
1973	40710.11218
1974	37557.34036
1975	25763.47323
1976	28353.1282
1977	28090.6737
1978	25027.22106
1979	25303.04158
1980	26517.45125
1981	25001.64167
1982	27354.02163
1983	28902.85064
1984	19859.93813
1985	11685.01942
1986	11099.90043
1987	9544.03919
1988	8775.9926
1989	9465.43757
1990	10030.15131
1991	10062.53333
1992	10501.83445
1993	8854.51043
1994	8997.11678
1995	9055.71211
1996	9222.18501
1997	16175.1953
1998	18814.37234
1999	14680.92492
2000	15720.11056
2001	16994.13392
2002	16662.99292
2003	15566.69219
2004	16180.823
2005	15178.82724
2006	14581.1072
2007	16222.45516
2008	15326.48752
2009	15608.494
2010	13710.07982
2011	16064.05182
2012	13395.36979
2013	11727.50972
2014	12650.86044