Year	Percent
1991	1.326
1992	1.333
1993	1.213
1994	1.29
1995	1.367
1996	1.357
1997	1.451
1998	1.42
1999	1.43
2000	1.229
2001	1.181
2002	0.691
2003	0.669
2004	0.665
2005	0.676
2006	0.66
2007	0.632
2008	0.626
2009	0.664
2010	0.659
2011	0.718
2012	0.858
2013	0.923
2014	0.942
2015	0.948
2016	0.911
2017	0.87
2018	0.849
2019	0.828
2020	0.809
2021	0.791
2022	0.773