Year	Measure
1960	336.9136
1961	365.84012
1962	363.16405
1963	394.93896
1964	410.25183
1965	440.88294
1966	451.75081
1967	486.58542
1968	497.129
1969	579.97249
1970	663.86151
1971	726.05046
1972	745.28395
1973	798.83518
1974	824.36122
1975	845.36244
1976	872.34937
1977	845.36895
1978	916.76939
1979	998.1607
1980	1022.46365
1981	1006.49413
1982	1119.20463
1983	1117.91313
1984	1115.89427
1985	1093.85857
1986	1208.47428
1987	1241.19567
1988	1299.58511
1989	1575.75452
1990	1680.96239
1991	1703.31644
1992	1813.88585
1993	1786.45194
1994	1827.69667
1995	2014.0205
1996	1986.83697
1997	2083.48768
1998	2240.06732
1999	2390.49473
2000	2390.09794
2001	2391.22819
2002	2477.48975
2003	2400.76592
2004	2462.98506
2005	2519.00493
2006	2390.32461
2007	2402.4264
2008	2337.27139
2009	2304.02668
2010	2222.62969
2011	2163.98211
2012	2039.0119
2013	2057.86133
2014	2034.51263
2015	2131.68189