Year	Percent
2007	21.2939
2008	24.64875
2009	25.6836
2010	39.8586
2011	27.34475
2012	36.47332
2013	40.29484
2014	32.3804
2015	30.08845
2016	21.81689
2017	21.03758
2018	13.90536
2019	28.79126
2020	29.8961
2021	23.51973