Year	Percent
1991	3.203
1992	3.724
1993	3.59
1994	4.451
1995	4.496
1996	4.232
1997	4.105
1998	4.002
1999	4.468
2000	4.381
2001	4.991
2002	4.443
2003	5.54
2004	7.375
2005	7.005
2006	7.403
2007	7.4
2008	7.881
2009	9.806
2010	9.401
2011	9.771
2012	9.957
2013	9.789
2014	9.967
2015	10.345
2016	10.697
2017	10.655
2018	10.684
2019	10.696
2020	10.658
2021	10.645
2022	10.641