Year	%
1996	27.28
1999	24.72
2000	24.9
2001	19.38
2002	20.09
2003	19.8
2006	17.82
2007	22.04
2008	16.15
2009	19.82
2010	15.6
2011	15.87
2012	15.64
2013	16.04
2015	16.63
2016	17.03
2017	17.38
2018	17.62
2019	19.91
2020	16.92
2021	17.33