Year	Measure
1971	28.57132
1972	32.72954
1973	35.30169
1974	32.85038
1975	45.77618
1976	51.57434
1977	59.16763
1978	60.66943
1979	59.79721
1980	68.02274
1981	50.87268
1982	81.84797
1983	81.68656
1984	62.02626
1985	80.40587
1986	90.83123
1987	89.2492
1988	87.08652
1989	97.01182
1990	87.02636
1991	89.54599
1992	90.00059
1993	100.82547
1994	95.50496
1995	91.43474
1996	85.85524
1997	81.95717
1998	76.92522
1999	75.72464
2000	74.44912
2001	75.52798
2002	104.60359
2003	101.86968
2004	123.56565
2005	129.25772
2006	111.69303
2007	138.83631
2008	127.1788
2009	120.57472
2010	136.36169
2011	150.13162
2012	156.73297
2013	142.67648
2014	144.47992