Year	Percent
1980	0.98437
1981	1.01235
1982	1.05778
1983	1.15352
1984	1.11679
1985	1.19438
1986	1.36872
1987	1.3425
1988	1.18046
1989	1.13514
1990	0.94935
1991	0.88214
1992	0.9099
1993	0.85138
1994	0.86034
1995	0.86294
2006	0.26876
2007	0.29227
2008	0.26481
2009	0.33728
2010	0.29768
2011	0.29085
2012	0.27574
2013	0.27479
2014	0.29991
2015	0.31623
2016	0.33217
2017	0.2906
2018	0.28806
2019	0.28121
2020	0.31379
2021	0.2792
2022	0.25766