Year	Percent
2002	19.18115
2003	19.52881
2004	27.48033
2005	28.81901
2006	36.37141
2007	33.03208
2008	11.68708
2009	23.00001
2010	21.16396
2011	13.33477
2012	16.23708
2013	14.64135
2014	10.35789
2015	14.39379
2016	17.92558
2017	22.67859