Year	Percent
1980-01-01	0.5960000000000000
1981-01-01	0.7223590000000000
1982-01-01	1.1222400000000000
1983-01-01	1.2038600000000000
1984-01-01	1.4450200000000000
1985-01-01	1.9596099999999999
1986-01-01	2.6201800000000000
1987-01-01	3.0217500000000000
1988-01-01	2.9322200000000000
1989-01-01	2.6837400000000002
1990-01-01	2.6243900000000000
1991-01-01	2.6250700000000000
1992-01-01	2.4334599999999997
1993-01-01	2.3233099999999998
1994-01-01	2.5706599999999997
1995-01-01	3.2379700000000002
1996-01-01	4.1303300000000010
1997-01-01	4.8828900000000000
1998-01-01	6.4093700000000000
1999-01-01	8.2287000000000000
2000-01-01	10.3171000000000000
2001-01-01	14.6382000000000000
2002-01-01	16.7986000000000000
2003-01-01	18.3442000000000000
2004-01-01	18.8906000000000000
2005-01-01	17.9370000000000000
2006-01-01	20.7228000000000000
2007-01-01	23.9190000000000000
2008-01-01	23.5717000000000000
2009-01-01	23.5424000000000000
2010-01-01	21.5720000000000000
2011-01-01	19.3405000000000000
2012-01-01	18.3214000000000000
2013-01-01	17.8301000000000000
2014-01-01	17.5504000000000000
2015-01-01	17.6112000000000000
2016-01-01	17.7240000000000000