Year	Percent
1986-01-01	49.5107660013051
1987-01-01	49.3078409292376
1988-01-01	48.1027883474541
1989-01-01	47.3814458699545
1990-01-01	47.3288686252444
1991-01-01	47.2918203300270
1992-01-01	46.7692643392419
1993-01-01	44.8325650383785
1994-01-01	44.5715791429084
1995-01-01	45.1733016340777
1996-01-01	45.7815450037906
1997-01-01	45.7954118066205
1998-01-01	45.4836696272179
1999-01-01	45.2277657541513
2000-01-01	45.6166586789597
2001-01-01	46.1416882910600
2002-01-01	46.3089979463813
2003-01-01	45.5535453374764
2004-01-01	44.9652921200228
2005-01-01	44.4496874789201
2006-01-01	45.2321742164453
2007-01-01	45.0602636366294
2008-01-01	43.9590750225506
2009-01-01	44.1323237055336
2010-01-01	41.5339661513198
2011-01-01	40.1999525345200
2012-01-01	40.4534641098081
2013-01-01	40.4496343923184
2014-01-01	40.2017095124460
2015-01-01	40.3365701078201
2016-01-01	40.5382911091235
2017-01-01	40.2971127178493