Year	Percent
1993	5.94262
1994	8.69683
1995	12.1663
1996	13.30245
1997	14.82748
1998	15.77408
1999	22.34747
2000	20.64748
2001	22.74648
2002	23.33468
2003	21.17332
2004	19.86197
2005	17.51223
2006	17.80903
2007	27.9197
2008	25.26977
2009	45.90644
2010	50.61355
2011	56.08959
2012	52.56848
2013	54.32632
2014	52.37359
2015	70.25548
2016	83.00191