Year	Percent
1980-01-01	2.7258500000000000
1981-01-01	2.5715900000000000
1982-01-01	2.5051900000000002
1983-01-01	2.3827500000000000
1984-01-01	2.2853400000000000
1985-01-01	2.6927500000000000
1986-01-01	2.5168200000000000
1987-01-01	2.2323300000000000
1988-01-01	1.4975700000000000
1989-01-01	0.9756950000000001
1990-01-01	2.3398900000000000
1991-01-01	2.1995200000000000
1992-01-01	7.1259300000000000
1993-01-01	8.7974100000000010
1994-01-01	9.2294900000000000
1995-01-01	8.8844600000000000
1996-01-01	11.9225000000000000
1997-01-01	15.0748000000000000
1998-01-01	19.6123000000000000
1999-01-01	21.4408000000000000
2000-01-01	22.3595000000000000
2001-01-01	24.1076000000000000
2002-01-01	27.5499000000000000
2003-01-01	31.4511000000000000
2004-01-01	29.7283000000000000
2005-01-01	27.9197000000000000
2006-01-01	25.9016000000000000
2007-01-01	21.2969000000000000
2008-01-01	17.9846000000000000
2009-01-01	21.1046000000000000
2010-01-01	19.6647000000000000
2011-01-01	18.3692000000000000
2012-01-01	17.8980000000000000
2013-01-01	16.6546000000000000
2014-01-01	16.1156000000000000
2015-01-01	16.7251000000000000
2016-01-01	15.7316000000000000