Year	Measure
1971	677.88586
1972	1307.24847
1973	1689.43586
1974	1860.55787
1975	2296.49086
1976	2790.04487
1977	3673.22224
1978	4107.8917
1979	4875.84555
1980	5626.52535
1981	5986.26104
1982	6969.05119
1983	7526.37543
1984	7758.9463
1985	8023.424
1986	8094.58925
1987	8137.92114
1988	8334.69719
1989	8090.34858
1990	8355.66995
1991	8015.12264
1992	8150.42755
1993	8958.0299
1994	9275.61724
1995	9273.44599
1996	9394.71494
1997	9820.334
1998	11133.68063
1999	12128.52583
2000	12232.62043
2001	12048.59123
2002	12401.23265
2003	12266.92521
2004	11902.35354
2005	12303.14165
2006	11823.08693
2007	11688.32179
2008	11613.97901
2009	10966.43493
2010	10968.25849
2011	10612.4261
2012	10698.21952
2013	10952.71146
2014	11263.53192