Year	Percent
1979	0.0176
1980	0.06182
1981	0.49878
1982	0.57641
1983	0.6874
1984	0.7394
1985	0.7756
1986	0.96594
1987	1.12825
1988	1.20224
1989	1.21761
1990	1.50666
1991	1.31729
1992	1.55091
1993	1.19505
1994	1.38589
1995	1.21424
1996	0.81905
1997	0.60331
1998	0.68579
1999	0.64503
2000	0.43007
2001	0.31461
2002	0.2843
2003	0.20698
2004	0.20897
2005	0.19498
2006	0.11549
2007	0.10111
2008	0.06723
2009	0.04933
2010	0.02371
2011	-0.01713
2012	-0.00458
2013	-0.01479
2014	-0.01973
2015	-0.0064
2016	-0.01653
2017	-0.0187
2018	-0.01159
2019	-0.00985
2020	-0.00899
2021	-0.00735