Year	Percent
1988-01-01	0.3919690000000000
1989-01-01	0.8310750000000000
1990-01-01	0.8703670000000000
1991-01-01	1.0745100000000000
1992-01-01	1.9192200000000001
1993-01-01	2.8323500000000000
1994-01-01	4.2851000000000000
1995-01-01	3.8680900000000000
1996-01-01	3.5841900000000000
1997-01-01	3.3773400000000002
1998-01-01	3.5486300000000000
1999-01-01	4.6335600000000000
2000-01-01	6.0633000000000000
2001-01-01	7.3484000000000000
2002-01-01	7.9512600000000000
2003-01-01	7.6157200000000000
2004-01-01	6.4637100000000000
2005-01-01	5.6848199999999990
2006-01-01	6.1631500000000000
2007-01-01	5.6751700000000000
2008-01-01	4.9822900000000000
2009-01-01	6.1930200000000000
2010-01-01	5.6690100000000000
2011-01-01	5.3218100000000000
2012-01-01	5.9407100000000000
2013-01-01	6.0519300000000005
2014-01-01	6.5404700000000000
2015-01-01	6.9513300000000005
2016-01-01	7.1203400000000000