Year	Percent
1991	4.569
1992	3.47
1993	3.242
1994	2.959
1995	3.02
1996	3.432
1997	3.679
1998	3.475
1999	3.373
2000	3.462
2001	3.362
2002	3.4
2003	3.356
2004	3.537
2005	3.448
2006	3.533
2007	3.512
2008	3.689
2009	3.256
2010	3.651
2011	3.514
2012	3.391
2013	3.281
2014	3.364
2015	3.165
2016	3.285
2017	3.369
2018	3.367
2019	3.373
2020	3.39
2021	3.398
2022	3.401