Year	Percent
1983-01-01	5.230460000000000
1984-01-01	5.681570000000000
1985-01-01	7.110320000000000
1986-01-01	8.083689999999999
1987-01-01	9.415310000000000
1988-01-01	8.703270000000000
1989-01-01	7.577240000000000
1990-01-01	7.272170000000000
1991-01-01	7.413780000000000
1992-01-01	7.182310000000000
1993-01-01	8.093200000000000
1994-01-01	9.170140000000000
1995-01-01	8.242050000000000
1996-01-01	9.308890000000000
1997-01-01	11.559100000000000
1998-01-01	12.899700000000000
1999-01-01	15.407100000000000
2000-01-01	16.571300000000000
2001-01-01	17.657600000000000
2002-01-01	13.695800000000000
2003-01-01	11.553200000000000
2004-01-01	11.202500000000000
2005-01-01	13.376300000000000
2006-01-01	19.541000000000000
2007-01-01	22.996400000000000
2008-01-01	18.446700000000000
2009-01-01	21.960700000000000
2010-01-01	21.286700000000000
2011-01-01	23.002700000000000
2012-01-01	25.513100000000000
2013-01-01	25.123100000000000
2014-01-01	26.778400000000000
2015-01-01	34.023700000000000
2016-01-01	28.546200000000000