Year	%
1990	96.98922
1992	97.14527
1993	77.65486
1995	75.71279
1996	57.50118
1997	37.28747
1998	65.41333
1999	46.85291
2000	67.40442
2001	57.96889
2002	63.58887
2003	60.84006
2004	46.36204
2005	38.7483
2006	39.02877
2007	36.7072
2008	45.9423
2009	33.65485
2010	44.06483
2011	39.01226
2012	25.8623
2013	25.47516
2014	18.66517
2015	20.2646
2016	24.58928
2017	22.84035