Year	Percent
1991	1.272
1992	1.246
1993	1.163
1994	1.515
1995	1.535
1996	1.494
1997	1.422
1998	1.36
1999	1.371
2000	0.953
2001	0.935
2002	0.93
2003	0.908
2004	0.852
2005	0.836
2006	0.82
2007	0.732
2008	0.773
2009	0.759
2010	0.835
2011	0.859
2012	0.845
2013	0.776
2014	0.812
2015	0.864
2016	0.884
2017	0.883
2018	0.86
2019	0.842
2020	0.827
2021	0.812
2022	0.798