Year	Measure
1971	402.40185
1972	400.70133
1973	398.79044
1974	398.78279
1975	407.06338
1976	401.6687
1977	417.77201
1978	419.24615
1979	422.43427
1980	424.14851
1981	431.98875
1982	438.24896
1983	440.03427
1984	440.48051
1985	443.55301
1986	436.30952
1987	430.82544
1988	430.99518
1989	433.51843
1990	425.16068
1991	416.9874
1992	409.69339
1993	412.25481
1994	415.14578
1995	411.374
1996	410.80872
1997	411.97788
1998	413.40221
1999	406.30475
2000	413.09162
2001	407.36184
2002	406.30515
2003	411.83483
2004	413.51545
2005	404.94954
2006	375.59751
2007	344.63615
2008	338.24474
2009	355.79588
2010	348.85465
2011	327.19926
2012	328.43759
2013	336.00359
2014	341.86267