Year	Percent
2001	62.23011
2002	43.59426
2003	52.8137
2004	52.07092
2005	58.56767
2006	73.42957
2007	83.19075
2008	25.4471
2009	34.131
2010	22.57685
2011	11.73702
2012	18.26695
2013	34.43406
2014	23.26894
2015	21.51949
2016	19.28636
2017	25.26611