Year	Percent
1990	1.22438
1991	1.2327
1992	1.2048
1993	1.22133
1994	1.16844
1995	1.43761
1996	1.44878
1997	1.18613
1998	1.17415
1999	1.03827
2000	1.03851
2001	0.88812
2002	0.87126
2003	0.86192
2004	0.99498
2005	0.98853
2006	0.97213
2007	0.83308
2008	0.82482
2009	0.6044
2010	0.59866
2011	0.53665
2012	0.52059
2013	0.50868
2014	0.5062
2015	0.47476
2016	0.48916
2017	0.45567
2018	0.4922
2019	0.47183
2020	0.49587