Year	Percent
1982-01-01	16.19120000000000
1983-01-01	17.03380000000000
1984-01-01	18.81410000000000
1985-01-01	20.68440000000000
1986-01-01	21.75950000000000
1987-01-01	36.69090000000000
1988-01-01	51.19460000000000
1989-01-01	52.12340000000000
1990-01-01	48.30020000000000
1991-01-01	42.50910000000000
1992-01-01	40.90570000000000
1993-01-01	41.68070000000000
1994-01-01	42.40060000000000
1995-01-01	40.76360000000000
1996-01-01	42.60820000000000
1997-01-01	48.97300000000000
1998-01-01	53.69390000000000
1999-01-01	58.74020000000000
2000-01-01	67.01660000000000
2001-01-01	75.63140000000000
2002-01-01	83.52360000000000
2003-01-01	89.93190000000000
2004-01-01	94.16360000000000
2005-01-01	96.96000000000000
2006-01-01	98.35190000000000
2007-01-01	98.86590000000000
2008-01-01	98.76180000000000
2009-01-01	98.48870000000000
2010-01-01	98.68590000000000
2011-01-01	98.97200000000001
2012-01-01	99.19240000000000
2013-01-01	99.22160000000000
2014-01-01	99.21540000000000
2015-01-01	99.46520000000000
2016-01-01	99.75990000000000