Year	Percent
1993	4.96437
1994	8.13216
1995	8.67993
1996	12.96298
1997	20.37175
1998	32.97831
1999	28.70509
2000	22.70785
2001	20.81345
2002	23.81427
2003	23.51398
2004	27.99236
2005	36.41539
2006	39.41975
2007	33.82469
2008	28.08567
2009	28.47883
2010	28.3557
2011	30.79522
2012	31.02667
2013	27.56579
2014	27.55506
2015	24.25506
2016	23.45859
2017	24.2952