Year	Percent
1990-01-01	18.1461000000000000
1991-01-01	16.8197000000000000
1992-01-01	15.0152000000000000
1993-01-01	16.0348000000000000
1994-01-01	16.9944000000000000
1995-01-01	16.9158000000000000
1996-01-01	17.4584000000000000
1997-01-01	17.2317000000000000
1998-01-01	0.7837729999999999
1999-01-01	0.9333250000000000
2000-01-01	0.8412390000000000
2001-01-01	1.0543000000000000
2002-01-01	1.3762299999999998
2003-01-01	1.2705799999999998
2004-01-01	2.3401000000000000
2005-01-01	3.0503600000000000
2006-01-01	2.2550500000000000
2007-01-01	2.6019900000000002
2008-01-01	2.2218000000000000
2009-01-01	2.0113600000000000
2010-01-01	1.5771000000000000
2011-01-01	26.1595000000000000
2012-01-01	30.9743000000000000
2013-01-01	31.2309999999999980
2014-01-01	32.5319000000000000
2015-01-01	29.8917000000000000
2016-01-01	33.4228000000000000