Year	Percent
1984	1.3538
1985	0.7789
1989	0.664
1990	0.5724
1992	1.4322
2000	1.9801
2003	1.0025
2004	1.2702
2005	2.9043
2006	0.5358
2007	2.3295
2008	2.4776
2009	2.3941
2010	2.3628
2011	3.0206
2012	1.8997
2013	4.324
2014	4.3709
2015	5.4416
2016	5.5173
2017	3.0527