Year	Percent
1992-01-01	5.19427507207184
1993-01-01	5.93741012836937
1994-01-01	8.29391528703505
1995-01-01	9.67646901280197
1996-01-01	9.99592003263974
1997-01-01	12.13724725672590
1998-01-01	13.53969554042990
1999-01-01	13.16683995841000
2000-01-01	10.64687788577160
2001-01-01	9.33599431722085
2002-01-01	8.13843577832991
2003-01-01	8.44756891348769
2004-01-01	8.00740117746005
2005-01-01	7.31073136196085
2006-01-01	7.49692739108928
2007-01-01	6.43777105627473
2008-01-01	6.57114049714973
2009-01-01	9.03073838307150
2010-01-01	7.96959150739797
2011-01-01	6.93270824256935
2012-01-01	5.81078468742812
2013-01-01	5.78925671761483
2014-01-01	5.48268218022642
2015-01-01	5.82296579110537
2016-01-01	5.74792562040632
2017-01-01	5.36024493931355