Year	Percent
1980	97.85575
1981	98.69341
1983	96.16943
1984	92.66821
1985	94.54727
1986	95.41938
1992	105.98543
1994	103.48824
1995	104.56055
1996	103.1229
1997	102.60899
1998	106.01212
1999	99.88461
2000	93.90665
2001	98.92361
2002	104.42822
2004	109.84905
2006	111.70323
2008	106.07525
2009	105.56288
2011	103.46515
2012	105.01646
2013	103.19623
2015	106.69382