Year	Percent
2001	4.18815
2002	4.5077
2003	3.55857
2004	3.35069
2005	12.51654
2006	28.51368
2007	24.91312
2008	42.09281
2009	8.25254
2010	25.62621
2011	13.78666
2012	8.89748
2013	4.01496
2014	7.59152
2015	8.85015
2016	6.58627
2017	8.75185