Year	Percent
1980	10.861
1981	7.932
1982	7.057
1983	6.546
1984	6.461
1985	6.563
1986	5.017
1987	4.269
1988	4.562
1989	5.501
1990	7.836
1991	7.161
1992	4.321
1993	2.956
1994	2.356
1995	1.264
1996	0.706
1997	0.654
1998	0.711
1999	0.239
2000	0.315
2001	0.154
2002	0.086
2003	0.072
2004	0.064
2005	0.07
2006	0.365
2007	0.861
2008	1.002
2009	0.67
2010	0.431
2011	0.341
2012	0.325
2013	0.236
2014	0.178
2015	0.132
2016	0.013
2017	0.015
2018	0.015
2019	-0.02
2020	-0.031