Year	%
2001	19.55
2005	18.56
2007	18.39
2008	18.28
2009	18.24
2010	17.95
2011	17.92
2012	17.44
2013	17.39
2014	17.39
2015	17.47
2016	17.56
2017	19.37
2018	23.32
2019	28.09
2020	23.32
2021	23.24