Year	%
1996	17.55
1999	15.51
2000	12.4
2001	13.68
2002	13.8
2003	13.42
2006	11.56
2007	11.46
2008	10.82
2009	13.78
2010	10.06
2011	11.04
2012	11.75
2013	11.74
2014	10.15
2015	10.17
2016	10.2
2017	38.02
2018	38.02
2019	37.99
2020	8.93