Year	%
2007	19.8
2008	19.79
2009	19.74
2010	19.35
2011	19.41
2012	18.96
2013	19.11
2014	18.8
2015	19.09
2016	18.81
2017	20.48
2018	21.01
2019	21.7
2020	19.95
2021	19.95