Year	Percent
1990	2.19534
1991	1.70093
1992	1.52161
1993	1.31578
1994	1.1985
1995	9.65876
1996	10.45044
1997	10.11147
1998	9.12018
1999	8.79832
2000	8.70568
2002	2.43693
2003	2.44578
2004	0.48726
2005	0.4665
2006	0.83994
2007	0.8334
2008	1.51257
2009	3.92894
2010	4.54987
2011	4.79486
2012	4.49616
2013	4.19523
2014	3.72706
2015	3.70073
2016	3.62354
2017	3.49016
2018	2.83865
2019	2.78231
2020	1.81205