Year	Percent
1990	1.28348
1991	1.30132
1992	1.13171
1993	1.07502
1994	1.04222
1995	1.07036
1996	1.0452
1997	1.02064
1998	1.007
1999	0.97306
2000	0.94128
2001	0.9109
2002	0.88187
2003	0.85918
2005	0.82619
2006	0.81965
2007	0.80313
2008	0.76688
2009	0.74485
2010	0.74153
2011	0.74467
2012	0.71032
2013	0.68771
2014	0.67471
2015	1.21572
2016	1.18607
2017	1.3789
2018	1.32226
2019	1.37156
2020	1.40961