Year	Measure
1971	371.22502
1972	380.27814
1973	379.72171
1974	379.03572
1975	380.8561
1976	360.23564
1977	363.62143
1978	368.18213
1979	364.6681
1980	363.86601
1981	353.46276
1982	355.66744
1983	355.46043
1984	353.93651
1985	360.56179
1986	353.57291
1987	348.13924
1988	346.623
1989	337.99245
1990	333.69817
1991	327.53982
1992	324.14739
1993	320.35366
1994	316.29356
1995	312.7613
1996	352.92018
1997	355.23834
1998	340.20168
1999	344.56186
2000	288.76845
2001	297.95472
2002	310.03973
2003	317.1984
2004	321.35532
2005	313.10631
2006	358.89854
2007	379.22782
2008	376.85968
2009	384.44718
2010	397.13633
2011	396.77239
2012	399.68014
2013	406.25378
2014	416.79577