Year	Percent
2000	16.37949
2001	16.5976
2002	16.81515
2003	17.03215
2004	17.2487
2005	17.46425
2006	17.67944
2007	17.89386
2008	18.10774
2009	18.32081
2010	18.53329
2011	18.74505
2012	18.95618
2013	19.16629
2014	19.37585
2015	19.58459
2016	19.79224
2017	19.99878
2018	20.20395
2019	20.40809
2020	20.61083
2021	20.81214
2022	21.01213