Year	Percent
1993	16.51777
1994	5.86134
1995	21.92609
1996	12.33084
1997	14.48866
1998	12.46883
1999	13.70269
2000	13.51261
2001	15.70885
2002	16.21102
2003	18.58468
2004	22.04511
2005	27.13609
2006	31.47614
2007	40.86846
2008	33.76795
2009	38.46573
2010	41.8127
2011	33.38398
2012	34.29609
2013	32.89935
2014	26.94649
2015	23.67195
2016	24.98391