Year	Percent
2004	3.08
2005	2.24
2009	2.91
2010	2.71
2011	2.43
2012	2.1
2013	2.36
2014	3.89
2015	3.89
2016	4.81
2017	5.61
2018	7.4
2019	7.98
2020	8.98