Year	Percent
1992	6.3683
1993	27.49361
1994	35.80554
1995	36.97134
1996	36.80243
1997	33.81211
1998	13.40549
1999	15.64969
2000	12.08029
2001	12.76329
2002	13.68364
2003	14.2814
2004	22.24415
2005	26.92056
2006	29.57467
2007	39.63077
2008	44.9034
2009	39.84434
2010	36.35518
2011	37.67207
2012	43.4894
2013	42.99912
2014	32.83259
2015	27.68564
2016	33.45006