Year	Percent
1988-01-01	1.2812600000000000
1989-01-01	1.5805300000000000
1990-01-01	1.4946300000000000
1991-01-01	1.6807700000000000
1992-01-01	2.4677300000000000
1993-01-01	3.3328900000000004
1994-01-01	4.8927900000000000
1995-01-01	4.2438600000000000
1996-01-01	3.8433800000000002
1997-01-01	3.8542400000000003
1998-01-01	4.2143100000000000
1999-01-01	5.5474000000000000
2000-01-01	7.1771300000000000
2001-01-01	8.6411100000000010
2002-01-01	8.8813200000000000
2003-01-01	8.1676600000000000
2004-01-01	7.1706199999999995
2005-01-01	6.8672900000000000
2006-01-01	7.6592400000000000
2007-01-01	7.2020800000000005
2008-01-01	6.2731100000000000
2009-01-01	7.6872800000000000
2010-01-01	7.2690300000000000
2011-01-01	6.9587900000000000
2012-01-01	8.2468000000000000
2013-01-01	9.2677100000000010
2014-01-01	11.1457000000000000
2015-01-01	11.8662000000000000
2016-01-01	12.6685000000000000