Year	Percent
1991	0.984
1992	0.968
1993	0.914
1994	1.502
1995	1.53
1996	1.456
1997	1.399
1998	1.437
1999	1.214
2000	1.116
2001	1.632
2002	1.258
2003	1.656
2004	1.811
2005	1.883
2006	2.468
2007	2.924
2008	3.545
2009	4.607
2010	5.093
2011	4.8
2012	4.014
2013	4.301
2014	4.197
2015	4.455
2016	3.926
2017	3.77
2018	3.682
2019	3.587
2020	3.49
2021	3.393
2022	3.295