Year	Percent
1980-01-01	2.0990800000000000
1981-01-01	2.0777500000000000
1982-01-01	2.9663200000000000
1983-01-01	3.5342700000000000
1984-01-01	3.5751600000000000
1985-01-01	7.3938500000000000
1986-01-01	5.9915699999999990
1987-01-01	6.8757199999999990
1988-01-01	6.5326400000000000
1989-01-01	5.7463200000000000
1990-01-01	5.2372300000000000
1991-01-01	6.2129400000000010
1992-01-01	6.3797400000000000
1993-01-01	7.7101100000000000
1994-01-01	8.7372900000000000
1995-01-01	7.9735000000000000
1996-01-01	5.9315300000000000
1997-01-01	5.2249200000000000
1998-01-01	6.6613700000000000
1999-01-01	7.0011700000000000
2000-01-01	4.8122300000000005
2001-01-01	4.2942800000000005
2002-01-01	5.6464200000000000
2003-01-01	7.5322600000000010
2004-01-01	8.4106300000000010
2005-01-01	10.0784000000000000
2006-01-01	10.8107000000000000
2007-01-01	12.1162000000000000
2008-01-01	12.5885000000000000
2009-01-01	20.3822000000000000
2010-01-01	19.6742000000000000
2011-01-01	18.8392000000000000
2012-01-01	20.0780000000000000
2013-01-01	24.2992000000000000
2014-01-01	25.3147000000000000
2015-01-01	30.3493000000000000
2016-01-01	34.1708000000000000