Year	Percent
1983	0.6784
1984	2.0812
1986	1.9376
1987	1.921
1988	1.6245
1989	1.7518
1990	1.9223
1991	2.5981
2007	1.8327
2008	0.7225
2010	1.2164
2011	0.9519
2012	0.3564
2013	0.5866
2014	0.2014
2015	0.915
2016	1.0555
2017	1.3349