Year	Percent
1980-01-01	11.20640000000000000
1981-01-01	17.79600000000000000
1982-01-01	19.43480000000000000
1983-01-01	11.08120000000000000
1984-01-01	7.23483999999999900
1985-01-01	5.83287000000000000
1986-01-01	5.99318000000000100
1987-01-01	5.73739000000000000
1988-01-01	3.80635000000000000
1989-01-01	2.67437999999999980
1990-01-01	1.55223000000000000
1991-01-01	1.40783000000000000
1992-01-01	1.15654000000000000
1993-01-01	0.84276200000000010
1994-01-01	1.75246000000000000
1995-01-01	0.85840100000000000
1996-01-01	0.76614300000000000
1997-01-01	0.46397700000000003
1998-01-01	0.42454400000000000
1999-01-01	3.00372000000000000
2000-01-01	2.47893000000000000
2001-01-01	2.89829000000000030
2002-01-01	0.63772900000000000
2003-01-01	2.23264000000000000
2004-01-01	1.18943000000000000
2005-01-01	2.02665999999999970
2006-01-01	2.99042000000000000
2007-01-01	3.94130000000000000
2008-01-01	4.86323000000000100
2009-01-01	5.56977000000000000
2010-01-01	5.60870999999999900
2011-01-01	5.42636000000000000
2012-01-01	4.30260000000000000
2013-01-01	3.83141000000000000
2014-01-01	2.90717000000000030
2015-01-01	2.97516000000000000
2016-01-01	1.72714000000000010