Year	Percent
2002	38.62789
2003	37.41886
2004	29.72107
2005	31.11485
2006	28.63597
2007	30.10501
2008	24.89227
2009	29.2975
2010	26.21007
2011	23.74366
2012	24.39087
2013	22.81066
2014	22.13704
2015	20.63432
2016	25.74031
2017	26.4202
2018	22.0429
2019	25.77397
2020	29.97558
2021	33.59762