Year	Percent
1980-01-01	22.2124000000000000
1981-01-01	30.6514000000000000
1982-01-01	38.4418000000000000
1983-01-01	46.0972000000000000
1984-01-01	53.0384000000000000
1985-01-01	59.1277000000000000
1986-01-01	64.3186000000000000
1987-01-01	61.4268000000000000
1988-01-01	61.1636000000000000
1989-01-01	0.7852979999999999
1990-01-01	0.7463420000000001
1991-01-01	5.2365600000000000
1992-01-01	3.1973400000000000
1993-01-01	2.5371799999999998
1994-01-01	1.7752700000000001
1995-01-01	1.3325000000000000
1996-01-01	1.0508200000000000
1997-01-01	0.9966160000000000
1998-01-01	0.7677760000000000
1999-01-01	2.5416700000000000
2000-01-01	3.5485500000000000
2001-01-01	4.5473500000000000
2002-01-01	2.7957600000000000
2003-01-01	1.6818300000000000
2004-01-01	1.4223500000000000
2005-01-01	0.6153700000000000
2006-01-01	0.6272409999999999
2007-01-01	0.6998479999999999
2008-01-01	1.6155200000000000
2009-01-01	2.8472299999999997
2010-01-01	8.5616100000000000
2011-01-01	8.2106900000000000
2012-01-01	13.3389000000000000
2013-01-01	18.4582000000000000
2014-01-01	23.5732000000000000
2015-01-01	21.5261000000000000
2016-01-01	21.5208000000000000