Year	Percent
2000	3.30026
2001	3.36165
2002	3.42304
2003	3.48442
2004	3.54581
2005	3.6072
2006	3.88025
2007	4.1604
2008	4.44762
2009	4.74193
2010	5.04332
2011	5.3518
2012	5.66736
2013	5.99001
2014	6.31974
2015	6.65655
2016	7.00045
2017	7.35143
2018	7.70949
2019	8.07464
2020	8.44687
2021	8.82619
2022	9.21259