Year	Percent
1991	0.869
1992	0.93
1993	0.91
1994	0.907
1995	0.926
1996	0.965
1997	0.925
1998	0.978
1999	0.936
2000	0.918
2001	1.066
2002	1.003
2003	0.973
2004	0.956
2005	0.96
2006	0.957
2007	0.918
2008	0.894
2009	0.87
2010	1.014
2011	1.07
2012	0.942
2013	0.817
2014	0.77
2015	0.85
2016	0.844
2017	0.864
2018	0.859
2019	0.853
2020	0.847
2021	0.841
2022	0.836