Year	Percent
1991	4.762
1992	4.809
1993	4.732
1994	4.553
1995	4.473
1996	4.889
1997	5.09
1998	5.237
1999	5.255
2000	5.323
2001	5.523
2002	5.415
2003	6.018
2004	2.941
2005	1.637
2006	2.121
2007	2.741
2008	3.655
2009	4.431
2010	5.001
2011	6.176
2012	7.638
2013	8.232
2014	8.862
2015	9.665
2016	9.608
2017	9.694
2018	9.693
2019	9.682
2020	9.672
2021	9.662
2022	9.653