Year	%
2007	19.34
2008	19.16
2009	19.15
2010	18.92
2011	18.92
2012	18.4
2013	18.32
2014	18.15
2015	18.7
2016	18.45
2017	19.9
2018	24.13
2019	39.96
2020	22.26
2021	22.24