Year	%
1996	21.71
1999	17.7
2000	17.77
2001	11.38
2002	12.12
2003	11.97
2005	11.85
2006	9.3
2007	8.78
2010	12.2
2011	12.18
2012	10.46
2013	11.05
2014	8.03
2015	7.45
2016	7.77
2019	7.5
2020	7.85