Year	%
2001	19.9919462993748
2002	21.4754740903632
2003	21.8283660680203
2004	19.8077977585992
2005	22.6675259310121
2006	21.7124698840836
2007	19.5170621432861
2008	14.3624874849132
2009	16.2985918016044
2010	15.0399219377783
2011	16.6384318820314
2012	25.4160979878521
2013	17.7645309774995
2014	17.1543328281811
2015	16.8565649096487
2016	20.1631198815837
2017	26.435363955968
2018	28.4471653114496