Year	Percent
1991-01-01	11.9510002136230
1992-01-01	12.8439998626709
1993-01-01	13.0489997863770
1994-01-01	13.8129997253418
1995-01-01	11.2510004043579
1996-01-01	13.2159996032715
1997-01-01	12.7390003204346
1998-01-01	13.4630002975464
1999-01-01	13.1479997634888
2000-01-01	11.8769998550415
2001-01-01	17.8659992218018
2002-01-01	15.5120000839233
2003-01-01	17.6250000000000
2004-01-01	18.5960006713867
2005-01-01	16.1620006561279
2006-01-01	15.4940004348755
2007-01-01	13.4840002059937
2008-01-01	11.6099996566772
2009-01-01	14.4860000610352
2010-01-01	13.2430000305176
2011-01-01	13.3290004730225
2012-01-01	14.0769996643066
2013-01-01	13.0200004577637
2014-01-01	11.7410001754761
2015-01-01	11.7740001678467
2016-01-01	11.0229997634888
2017-01-01	10.4980001449585