Year	Percent
1980	106.28297
1981	102.19388
1982	99.52596
1983	98.48083
1984	102.1333
1985	101.76794
1986	103.62888
1989	102.54349
1990	102.86266
1991	103.92018
1992	104.62401
1993	105.71329
1994	102.82546
1995	99.12715
1996	93.53789
2012	99.9433
2013	98.24198
2014	101.36187
2015	104.11116
2016	103.19235