Year	Percent
2009	38.33387
2010	37.36358
2011	37.56902
2012	36.81417
2013	32.25891
2014	33.98562
2015	31.52738
2016	31.91899
2017	32.79017
2018	31.24133
2019	28.34183
2020	29.49594
2021	35.75533
2022	36.21711