Year	Percent
1991	1.132
1992	1.614
1993	1.615
1994	1.787
1995	1.909
1996	1.746
1997	1.792
1998	1.574
1999	1.58
2000	1.701
2001	1.87
2002	1.856
2003	1.797
2004	1.244
2005	1.751
2006	1.753
2007	1.694
2008	1.727
2009	1.788
2010	1.725
2011	1.911
2012	1.784
2013	1.759
2014	1.709
2015	1.571
2016	1.435
2017	1.348
2018	1.344
2019	1.34
2020	1.336
2021	1.332
2022	1.328