Year	%
1990	96.98922
1992	71.79836
1993	46.95576
1994	10.1924
1995	75.71279
1996	57.50118
1997	25.5491
1998	65.41333
1999	19.48723
2000	41.54211
2001	31.48919
2002	36.90454
2003	29.29917
2004	20.15354
2005	17.50572
2006	20.38802
2007	13.95066
2008	25.19699
2009	17.52089
2010	29.00648
2011	18.49466
2012	12.5776
2013	10.53929
2014	7.977519
2015	8.579397
2016	11.43056
2017	8.818129