Year	Percent
1990	11.06841
1991	14.85851
1992	10.44401
1993	8.75307
1994	5.38409
1995	4.63863
1996	3.47651
1997	3.83812
1998	11.24868
1999	6.61855
2000	5.89164
2001	6.99882
2002	4.40998
2003	4.08362
2004	4.3774
2005	3.06477
2006	2.89166
2007	3.34778
2008	2.70791
2009	3.64375
2010	2.7545
2011	2.63335
2012	2.72354
2013	2.81339
2014	3.7652
2015	18.8057