Year	Percent
1991-01-01	5.89499998092651
1992-01-01	3.71300005912781
1993-01-01	4.11800003051758
1994-01-01	4.90399980545044
1995-01-01	7.23999977111816
1996-01-01	8.63000011444092
1997-01-01	8.01700019836426
1998-01-01	10.21899986267090
1999-01-01	11.71800041198730
2000-01-01	10.77299976348880
2001-01-01	10.78699970245360
2002-01-01	11.44600009918210
2003-01-01	12.77200031280520
2004-01-01	10.62100028991700
2005-01-01	8.13399982452393
2006-01-01	6.99100017547607
2007-01-01	6.13299989700317
2008-01-01	5.95699977874756
2009-01-01	7.60599994659424
2010-01-01	5.36499977111816
2011-01-01	5.61899995803833
2012-01-01	5.67899990081787
2013-01-01	4.13399982452393
2014-01-01	4.57299995422363
2015-01-01	4.69299983978271
2016-01-01	4.73899984359741
2017-01-01	4.48999977111816