Year	Measure
1971	893.15323
1972	890.73493
1973	841.94113
1974	821.9737
1975	731.37216
1976	762.28919
1977	777.93721
1978	793.56355
1979	826.67181
1980	841.30941
1981	841.76333
1982	760.1328
1983	773.83892
1984	801.36718
1985	786.68828
1986	808.50135
1987	820.57551
1988	913.24609
1989	1006.65103
1990	1057.93803
1991	1064.48601
1992	1133.11635
1993	1143.58753
1994	1211.33062
1995	1282.9445
1996	1401.31465
1997	1548.09639
1998	1582.22522
1999	1660.00993
2000	1648.96551
2001	1599.05747
2002	1636.46623
2003	1635.06923
2004	1722.28949
2005	1756.5981
2006	1809.0608
2007	1856.83084
2008	1820.25367
2009	1754.22334
2010	1815.2759
2011	1959.3588
2012	2149.49145
2013	2215.80043
2014	2049.68883
2015	2028.88601