Year	Percent
1980-01-01	1.4032400000000000
1981-01-01	1.6933700000000000
1982-01-01	1.8930099999999999
1983-01-01	1.7626500000000000
1984-01-01	1.5628799999999998
1985-01-01	2.5911600000000000
1986-01-01	2.9878200000000000
1987-01-01	3.9682600000000000
1988-01-01	5.0611900000000000
1989-01-01	6.2603900000000000
1990-01-01	7.1636800000000000
1991-01-01	11.0296000000000000
1992-01-01	11.2464000000000000
1993-01-01	15.0018000000000000
1994-01-01	16.8848000000000000
1995-01-01	18.9004000000000000
1996-01-01	22.7295000000000000
1997-01-01	26.5805000000000000
1998-01-01	29.3990000000000000
1999-01-01	29.3354000000000000
2000-01-01	34.0027000000000000
2001-01-01	34.4750000000000000
2002-01-01	39.6943000000000000
2003-01-01	41.9090000000000000
2004-01-01	42.2950000000000000
2005-01-01	39.6922000000000000
2006-01-01	50.2984000000000000
2007-01-01	56.2075000000000000
2008-01-01	55.7608000000000000
2009-01-01	71.0795000000000000
2010-01-01	73.3173000000000000
2011-01-01	59.2784000000000000
2012-01-01	62.9756000000000000
2013-01-01	65.9743000000000000
2014-01-01	53.1352000000000000
2015-01-01	59.6553000000000000
2016-01-01	58.6713000000000000