Year	Percent
1988-01-01	385.885000000000000
1989-01-01	2.314890000000000
1990-01-01	2.314890000000000
1991-01-01	2.314890000000000
1992-01-01	12.806200000000000
1993-01-01	9.856740000000000
1994-01-01	7.614990000000000
1995-01-01	7.859839999999999
1996-01-01	7.646100000000000
1997-01-01	8.813300000000000
1998-01-01	10.017300000000000
1999-01-01	11.083800000000000
2000-01-01	13.226400000000000
2001-01-01	10.705400000000000
2002-01-01	9.644110000000001
2003-01-01	9.611369999999999
2004-01-01	8.155590000000000
2005-01-01	8.207830000000000
2006-01-01	11.379500000000000
2007-01-01	10.375500000000000
2008-01-01	12.823300000000000
2009-01-01	17.869600000000000
2010-01-01	21.689200000000000
2011-01-01	22.583000000000002
2012-01-01	22.072400000000000
2013-01-01	24.948500000000000
2014-01-01	28.614500000000000
2015-01-01	30.911200000000000
2016-01-01	31.799200000000000