Year	Measure
1971	815.1192
1972	967.01102
1973	1001.16947
1974	1046.02825
1975	695.84961
1976	736.22259
1977	756.53509
1978	756.53096
1979	685.05034
1980	661.10506
1981	645.7094
1982	768.56764
1983	740.65408
1984	592.91097
1985	579.82467
1986	606.33775
1987	641.79106
1988	612.90126
1989	578.55565
1990	866.25015
1991	712.03823
1992	1444.00701
1993	1523.23506
1994	1693.95822
1995	2048.12725
1996	2101.87928
1997	2156.69622
1998	2235.6107
1999	2261.96088
2000	2274.48601
2001	2275.67238
2002	2343.21148
2003	2405.88886
2004	2376.88899
2005	2392.99909
2006	2366.78973
2007	1921.83874
2008	1156.93866
2009	1218.58063
2010	1213.25709
2011	1203.3958
2012	1038.01771
2013	1015.49649
2014	1055.52347