Year	Percent
1991	45.77184
1992	92.9416
1993	64.63716
1994	44.36262
1995	18.59164
1996	14.53064
1997	21.43367
1998	22.40033
1999	22.14823
2000	30.01954
2001	27.57969
2002	26.00256
2003	26.29288
2004	21.4517
2005	25.24922
2006	26.63927
2007	26.34785
2008	32.73577
2009	38.70435
2010	45.49713
2011	49.24282
2012	58.68623
2013	68.8698
2014	64.984
2015	74.02208
2016	71.03136