Year	Percent
1991-01-01	7.64300012588501
1992-01-01	5.11700010299683
1993-01-01	5.16599988937378
1994-01-01	5.20800018310547
1995-01-01	5.44399976730347
1996-01-01	7.35699987411499
1997-01-01	5.60099983215332
1998-01-01	6.79500007629395
1999-01-01	6.51700019836426
2000-01-01	6.61899995803833
2001-01-01	6.85200023651123
2002-01-01	6.94199991226196
2003-01-01	9.23200035095215
2004-01-01	10.52700042724610
2005-01-01	8.98700046539307
2006-01-01	6.30200004577637
2007-01-01	5.56199979782104
2008-01-01	5.61600017547607
2009-01-01	6.07800006866455
2010-01-01	7.62699985504150
2011-01-01	8.22099971771240
2012-01-01	7.09700012207031
2013-01-01	7.29799985885620
2014-01-01	9.46300029754639
2015-01-01	7.91300010681152
2016-01-01	8.49300003051758
2017-01-01	8.20800018310547