Year	Percent
1980-01-01	1.1305700000000000
1981-01-01	1.5534500000000000
1982-01-01	1.4637100000000000
1983-01-01	1.0971200000000000
1984-01-01	1.5816100000000000
1985-01-01	1.5074400000000000
1986-01-01	1.2961300000000000
1987-01-01	2.3026100000000000
1988-01-01	2.9923200000000000
1989-01-01	2.8112600000000000
1990-01-01	3.8597099999999998
1991-01-01	3.1451200000000000
1992-01-01	2.7585700000000000
1993-01-01	3.1764400000000000
1994-01-01	3.0694200000000000
1995-01-01	3.0121500000000000
1996-01-01	3.2533800000000000
1997-01-01	4.0302100000000000
1998-01-01	4.4412800000000000
1999-01-01	4.6306699999999990
2000-01-01	4.6578500000000000
2001-01-01	7.4340300000000000
2002-01-01	6.8845300000000010
2003-01-01	6.9160400000000000
2004-01-01	5.3327000000000000
2005-01-01	7.0481000000000000
2006-01-01	8.0970100000000010
2007-01-01	7.4589200000000000
2008-01-01	7.7692700000000000
2009-01-01	10.0642000000000000
2010-01-01	9.3432900000000000
2011-01-01	16.1990000000000000
2012-01-01	17.1526000000000000
2013-01-01	21.9481000000000000
2014-01-01	23.0434000000000000
2015-01-01	24.8960000000000000
2016-01-01	22.9069000000000000