Year	Percent
1991-01-01	9.96605
1992-01-01	11.32070
1993-01-01	20.71210
1994-01-01	28.16440
1995-01-01	33.68510
1996-01-01	31.55230
1997-01-01	33.62820
1998-01-01	36.62060
1999-01-01	36.86640
2000-01-01	29.46350
2001-01-01	23.19160
2002-01-01	22.62490
2003-01-01	28.24190
2004-01-01	31.66760
2005-01-01	34.29240
2006-01-01	50.29390
2007-01-01	78.73540
2008-01-01	68.94590
2009-01-01	58.91610
2010-01-01	72.48500
2011-01-01	70.59980
2012-01-01	63.15380
2013-01-01	65.88590
2014-01-01	70.15620
2015-01-01	64.88520
2016-01-01	60.75040
2017-01-01	66.59420