Year	Percent
1998	8.74259
1999	14.82663
2000	41.06512
2001	18.47174
2002	4.05644
2003	11.50504
2004	13.12494
2005	22.5605
2006	23.20071
2007	29.35812
2008	30.57063
2009	25.35698
2010	36.17476
2011	38.68403
2012	28.51437
2013	27.87752
2014	44.55079
2015	58.51875
2016	41.52914
2017	35.8475