Year	Percent
1990	90.23724
1993	78.48364
1995	86.11638
1996	87.78301
1997	93.02479
1999	94.60498
2000	95.73542
2001	94.4377
2002	90.51898
2003	94.75663
2004	99.22285
2005	102.84162
2006	98.87351
2008	91.71988
2009	93.15514
2010	94.66775
2011	97.45679
2012	94.66046
2015	93.43794
2016	91.95834