Year	Percent
1990-01-01	2.4828200000000002
1991-01-01	2.2828300000000000
1992-01-01	2.3656000000000000
1993-01-01	2.6742500000000000
1994-01-01	2.7645900000000000
1995-01-01	2.9789300000000000
1996-01-01	3.5517500000000000
1997-01-01	4.2150700000000000
1998-01-01	5.3855200000000000
1999-01-01	6.7977399999999990
2000-01-01	9.0278200000000000
2001-01-01	9.8794899999999990
2002-01-01	13.3314000000000000
2003-01-01	14.8799000000000000
2004-01-01	14.7508000000000000
2005-01-01	14.4560000000000000
2006-01-01	13.1951000000000000
2007-01-01	17.2444000000000000
2008-01-01	15.7040000000000000
2009-01-01	16.2177000000000000
2010-01-01	16.2118000000000000
2011-01-01	15.8092000000000000
2012-01-01	15.2946000000000000
2013-01-01	16.2165000000000000
2014-01-01	16.3372000000000000
2015-01-01	21.0971000000000000
2016-01-01	28.7705000000000000