Year	%
1996	24.83
1999	23.35
2000	18.39
2001	16.86
2002	16.86
2003	17.32
2004	17.26
2005	17.26
2006	13.64
2007	13.8
2008	15.69
2009	18.21
2010	21.28
2011	21.28
2012	17.95
2013	16.63
2014	16.18
2015	15.96
2016	15.8
2017	13.56
2018	16.09
2019	16.12
2020	16.12
2021	16.12