Year	Percent
1980-01-01	10.1289000000000000
1981-01-01	11.1927000000000000
1982-01-01	8.1270200000000000
1983-01-01	6.9190200000000000
1984-01-01	7.6616100000000005
1985-01-01	7.1215500000000000
1986-01-01	6.2685200000000000
1987-01-01	7.7545399999999995
1988-01-01	8.7564500000000000
1989-01-01	11.5363000000000000
1990-01-01	19.5407000000000000
1991-01-01	21.6414000000000000
1992-01-01	25.4113000000000000
1993-01-01	24.3375000000000000
1994-01-01	17.3869000000000000
1995-01-01	40.5903000000000000
1996-01-01	42.8794000000000000
1997-01-01	32.5937000000000000
1998-01-01	40.1079000000000000
1999-01-01	43.7889000000000000
2000-01-01	50.2341000000000000
2001-01-01	39.6979000000000000
2002-01-01	23.2327000000000000
2003-01-01	32.4790000000000000
2004-01-01	40.0581000000000000
2005-01-01	34.5753000000000000
2006-01-01	35.5001000000000000
2007-01-01	58.6788000000000000
2008-01-01	53.6924000000000000
2009-01-01	39.1318000000000000
2010-01-01	39.7421000000000000
2011-01-01	42.3335000000000000
2012-01-01	40.2209000000000000
2013-01-01	40.6638000000000000
2014-01-01	41.3868000000000000
2015-01-01	38.8233000000000000
2016-01-01	34.0802000000000000
2017-01-01	37.0412000000000000