Year	Percent
1991-01-01	0.402999997138977
1992-01-01	0.479000002145767
1993-01-01	0.541000008583069
1994-01-01	0.606999993324280
1995-01-01	0.690999984741211
1996-01-01	0.731999993324280
1997-01-01	0.809000015258789
1998-01-01	0.879000008106232
1999-01-01	0.948000013828278
2000-01-01	1.029000043869020
2001-01-01	1.105000019073490
2002-01-01	1.192999958992000
2003-01-01	1.495000004768370
2004-01-01	1.830000042915340
2005-01-01	2.160000085830690
2006-01-01	2.482000112533570
2007-01-01	2.796999931335450
2008-01-01	3.134000062942500
2009-01-01	3.431999921798710
2010-01-01	3.757999897003170
2011-01-01	4.084000110626220
2012-01-01	4.327000141143800
2013-01-01	3.065000057220460
2014-01-01	1.884999990463260
2015-01-01	1.889000058174130
2016-01-01	1.998000025749210
2017-01-01	2.098000049591060