Year	Percent
1991	1.775
1992	1.824
1993	1.833
1994	1.809
1995	1.79
1996	1.77
1997	1.733
1998	1.7
1999	1.714
2000	1.752
2001	1.679
2002	1.647
2003	1.911
2004	1.862
2005	1.872
2006	1.834
2007	1.864
2008	1.883
2009	1.868
2010	1.896
2011	1.951
2012	1.892
2013	1.865
2014	1.868
2015	1.888
2016	1.869
2017	1.898
2018	1.9
2019	1.903
2020	1.904
2021	1.892
2022	1.882