Year	Percent
1990	30.97974
1991	26.72427
1992	23.17518
1993	21.29672
1994	20.64045
1995	25.87757
1996	34.98147
1997	35.73296
1998	24.94727
1999	34.34009
2000	46.42627
2001	42.434
2002	42.08722
2003	43.01479
2004	45.16405
2005	48.98942
2006	49.24737
2007	49.47306
2008	44.85838
2009	52.7975
2010	43.78043
2011	46.4661
2012	46.544
2013	43.88086
2014	44.03811
2015	58.78061
2016	91.1942