Year	Percent
1991-01-01	1.35300004482269
1992-01-01	1.13900005817413
1993-01-01	1.13100004196167
1994-01-01	7.67899990081787
1995-01-01	11.18099975585940
1996-01-01	13.19699954986570
1997-01-01	13.23799991607670
1998-01-01	13.34000015258790
1999-01-01	13.70699977874760
2000-01-01	12.98499965667720
2001-01-01	10.62300014495850
2002-01-01	16.72900009155270
2003-01-01	14.34700012207030
2004-01-01	14.09599971771240
2005-01-01	8.28199958801270
2006-01-01	7.16800022125244
2007-01-01	6.67799997329712
2008-01-01	7.39200019836426
2009-01-01	6.67500019073486
2010-01-01	5.21700000762939
2011-01-01	4.57800006866455
2012-01-01	3.93899989128113
2013-01-01	3.92000007629395
2014-01-01	4.63800001144409
2015-01-01	4.51800012588501
2016-01-01	4.54199981689453
2017-01-01	4.48299980163574