Year	Percent
1991	1.085
1992	1.136
1993	1.08
1994	1.155
1995	1.23
1996	1.164
1997	1.058
1998	0.922
1999	0.758
2000	0.774
2001	0.681
2002	0.691
2003	0.583
2004	0.595
2005	0.728
2006	0.668
2007	0.747
2008	0.727
2009	0.553
2010	0.605
2011	0.657
2012	0.686
2013	0.601
2014	0.712
2015	0.645
2016	0.625
2017	0.613
2018	0.598
2019	0.583
2020	0.568
2021	0.552
2022	0.537