Year	Percent
1987	103.4772
1988	106.04627
1989	105.48125
1990	101.51787
1991	97.64301
1992	96.00778
1993	95.73646
1994	97.10094
1995	100.98615
1996	100.21423
1998	97.75443
1999	96.07235
2000	96.00408
2001	101.82613
2002	100.94529
2003	102.17339
2004	99.93725
2005	100.84384
2006	96.80404
2007	98.04985
2008	99.51747
2009	98.14646
2010	98.14365
2011	98.24205
2012	99.81495
2013	100.61957
2014	98.90644
2015	99.3426
2016	100.6803