Year	Percent
1990-01-01	3.2626000000000000
1991-01-01	2.9165500000000000
1992-01-01	2.7988900000000000
1993-01-01	2.8167800000000000
1994-01-01	2.5791000000000000
1995-01-01	2.5147200000000000
1996-01-01	2.8892900000000004
1997-01-01	3.5112000000000000
1998-01-01	5.0118500000000000
1999-01-01	6.4423300000000000
2000-01-01	7.4836199999999990
2001-01-01	7.8821900000000000
2002-01-01	9.8029000000000000
2003-01-01	11.3775000000000000
2004-01-01	16.7469000000000000
2005-01-01	24.2921000000000000
2006-01-01	28.7874000000000000
2007-01-01	28.4818000000000000
2008-01-01	32.9550000000000000
2009-01-01	33.2886000000000000
2010-01-01	32.8672000000000000
2011-01-01	30.4528000000000000
2012-01-01	34.1863000000000000
2013-01-01	34.7156000000000000
2014-01-01	37.4525000000000000
2015-01-01	45.4843000000000000
2016-01-01	52.4698000000000000