Year	Percent
1980-01-01	0.32415700000000003
1981-01-01	0.39506500000000000
1982-01-01	0.53118400000000000
1983-01-01	0.87240900000000000
1984-01-01	1.20385000000000000
1985-01-01	1.76606000000000000
1986-01-01	2.50227000000000000
1987-01-01	3.06612000000000000
1988-01-01	3.40704000000000030
1989-01-01	4.03435000000000000
1990-01-01	3.82779000000000020
1991-01-01	3.85233000000000030
1992-01-01	3.97456000000000000
1993-01-01	5.21583000000000000
1994-01-01	7.00168999999999900
1995-01-01	8.37501000000000100
1996-01-01	11.31299999999999900
1997-01-01	14.92820000000000000
1998-01-01	18.70250000000000000
1999-01-01	23.68470000000000000
2000-01-01	34.55470000000000000
2001-01-01	38.89380000000000000
2002-01-01	47.82590000000000000
2003-01-01	51.68120000000000000
2004-01-01	55.66560000000000000
2005-01-01	54.07520000000000000
2006-01-01	64.10140000000000000
2007-01-01	64.73170000000000000
2008-01-01	57.42340000000000000
2009-01-01	63.03750000000000000
2010-01-01	58.64670000000000000
2011-01-01	53.66590000000000000
2012-01-01	57.79860000000000000
2013-01-01	54.04170000000000000
2014-01-01	48.76760000000000000
2015-01-01	50.73620000000000000
2016-01-01	48.49899999999999500