Year	Percent
1991	2.406
1992	2.401
1993	2.43
1994	2.454
1995	2.519
1996	2.566
1997	2.678
1998	2.814
1999	2.679
2000	2.808
2001	2.884
2002	2.98
2003	2.969
2004	3.006
2005	3.008
2006	3.043
2007	3.041
2008	3.049
2009	3.085
2010	3.131
2011	3.203
2012	3.243
2013	3.329
2014	3.401
2015	3.312
2016	3.312
2017	3.331
2018	3.366
2019	3.392
2020	3.415
2021	3.435
2022	3.454