Year	Percent
1990	1.76053
1991	1.74335
1992	1.73702
1993	1.72378
1994	1.36996
1995	1.32431
1996	1.20822
1997	1.18834
1998	1.13381
1999	1.11305
2000	1.09407
2001	1.07708
2002	1.06166
2003	1.04728
2004	0.88603
2005	1.19361
2006	1.15418
2007	1.11796
2008	1.08637
2009	0.92645
2010	0.90427
2011	0.8835
2012	0.89781
2013	0.914
2014	0.93197
2015	0.93914
2016	0.94681
2017	1.08044
2018	1.08905
2019	1.07461
2020	1.08917