Year	Percent
1991	1.004
1992	1.092
1993	1.084
1994	1.141
1995	1.198
1996	1.194
1997	1.05
1998	1.06
1999	1.103
2000	1.141
2001	1.289
2002	1.259
2003	1.241
2004	2.04
2005	3.121
2006	5.623
2007	6.422
2008	8.065
2009	9.76
2010	6.732
2011	8.634
2012	7.1
2013	10.275
2014	8.389
2015	9.262
2016	9.035
2017	9.245
2018	9.045
2019	8.927
2020	8.38
2021	8.023
2022	8.05