Year	Percent
1993	0.4054
1994	4.39366
1995	13.25057
1996	13.09144
1997	11.3972
1998	18.82947
1999	21.18901
2000	30.195
2001	31.15374
2002	20.47919
2003	21.88556
2004	17.87042
2005	14.81116
2006	7.64417
2007	9.39774
2008	12.34276
2009	11.43741
2010	24.51631
2011	12.68614
2012	9.82322
2013	10.06966
2014	12.15209
2015	16.81379
2016	18.55322