Year	Measure
1971	415.90598
1972	406.50677
1973	439.95459
1974	428.83247
1975	442.13067
1976	450.65062
1977	456.75778
1978	451.7899
1979	465.56602
1980	472.91474
1981	462.54288
1982	461.90769
1983	488.85484
1984	427.82996
1985	437.42964
1986	425.77979
1987	433.35542
1988	446.42096
1989	457.39406
1990	463.44304
1991	451.40009
1992	460.57014
1993	449.35187
1994	470.33558
1995	481.44149
1996	486.67431
1997	500.83783
1998	504.00575
1999	506.23132
2000	512.74833
2001	480.65042
2002	477.11867
2003	468.65996
2004	458.07829
2005	450.35009
2006	439.23964
2007	432.80676
2008	441.91993
2009	414.07766
2010	431.01025
2011	426.82199
2012	446.53887
2013	454.85666
2014	476.24472