Year	Percent
1980-01-01	3.4959000000000000
1981-01-01	2.6628900000000000
1982-01-01	3.7547900000000003
1983-01-01	5.8628700000000000
1984-01-01	8.3897300000000000
1985-01-01	8.5813000000000000
1986-01-01	4.1244200000000000
1987-01-01	4.4072100000000000
1988-01-01	3.2332099999999997
1989-01-01	1.1176000000000000
1990-01-01	2.0097800000000000
1991-01-01	1.3367300000000000
1992-01-01	0.9152860000000000
1993-01-01	3.2423599999999997
1994-01-01	2.8333300000000000
1995-01-01	0.8912329999999999
1996-01-01	1.5875800000000000
1997-01-01	1.1592200000000001
1998-01-01	1.3034700000000001
1999-01-01	3.8502699999999996
2000-01-01	4.3571300000000010
2001-01-01	2.9929099999999997
2002-01-01	4.2808000000000000
2003-01-01	2.9954300000000000
2004-01-01	3.6585400000000003
2005-01-01	3.0775700000000000
2006-01-01	4.2144600000000000
2007-01-01	4.8271400000000000
2008-01-01	3.7276300000000004
2009-01-01	4.9605200000000000
2010-01-01	6.5310200000000000
2011-01-01	8.4966500000000000
2012-01-01	8.7344800000000000
2013-01-01	6.6549100000000010
2014-01-01	4.6350500000000000
2015-01-01	5.5278500000000000
2016-01-01	5.7524800000000000