Year	Percent
1991-01-01	33.052700000000000
1992-01-01	23.579400000000000
1993-01-01	10.910900000000000
1994-01-01	13.623500000000000
1995-01-01	9.797260000000001
1996-01-01	13.246300000000000
1997-01-01	13.953700000000000
1998-01-01	15.707900000000000
1999-01-01	15.637000000000000
2000-01-01	17.517600000000000
2001-01-01	18.609200000000000
2002-01-01	21.917400000000000
2003-01-01	27.683900000000000
2004-01-01	28.586600000000000
2005-01-01	29.423500000000000
2006-01-01	28.181700000000000
2007-01-01	30.341900000000000
2008-01-01	26.014500000000000
2009-01-01	29.915000000000000
2010-01-01	39.190800000000000
2011-01-01	41.919900000000000
2012-01-01	43.021100000000000
2013-01-01	44.397600000000000
2014-01-01	45.525900000000000
2015-01-01	45.343200000000000
2016-01-01	46.900400000000000