Year	Percent
1987	103.98235
1988	105.72881
1989	105.43655
1990	101.63807
1991	97.24131
1992	96.59803
1993	95.9705
1994	97.05054
1995	100.48488
1996	101.23879
1997	100.37601
1998	98.01837
1999	95.85336
2000	96.20359
2001	102.1508
2002	100.87145
2003	101.91707
2004	100.18132
2005	100.19322
2006	96.77712
2007	98.18629
2008	98.77861
2009	97.86471
2010	98.63068
2011	98.20484
2012	100.0413
2013	99.64524
2014	98.88342
2015	99.02334
2016	100.88846