Year	Percent
2000	20.59194
2001	20.60757
2002	20.6232
2003	20.63883
2004	20.65446
2005	21.85176
2006	23.04947
2007	24.3296
2008	25.61761
2009	26.92019
2010	28.23805
2011	29.57155
2012	30.92076
2013	32.28639
2014	33.66852
2015	35.06824
2016	36.48563
2017	36.57503
2018	36.6727
2019	36.77826
2020	36.89208