Year	Percent
1979	13.51193
1980	8.74523
1981	8.60385
1982	10.15648
1983	10.99089
1984	13.1049
1985	8.60295
1986	6.87021
1987	3.73787
2004	0.43113
2005	0.51957
2006	0.41122
2007	114.38649
2008	119.67957
2009	5.81156
2010	1.42763
2011	0.23716
2012	0.64925
2013	0.75602
2014	2.42833
2015	8.20015
2016	2.94285