Year	Percent
1980-01-01	1.0590100000000000
1981-01-01	1.2314900000000000
1982-01-01	1.5231299999999999
1983-01-01	2.2410400000000004
1984-01-01	2.7116000000000000
1985-01-01	3.6135200000000000
1986-01-01	3.0097000000000000
1987-01-01	3.0227700000000000
1988-01-01	3.0299300000000000
1989-01-01	2.9799500000000000
1990-01-01	3.5166199999999996
1991-01-01	3.7935800000000004
1992-01-01	4.3972700000000000
1993-01-01	8.8451500000000000
1994-01-01	11.1209999999999990
1995-01-01	11.9323000000000000
1996-01-01	14.4977000000000000
1997-01-01	16.9883000000000000
1998-01-01	21.7555000000000000
1999-01-01	24.8446000000000000
2000-01-01	30.7605000000000000
2001-01-01	32.8790000000000000
2002-01-01	35.7897000000000000
2003-01-01	40.6906000000000000
2004-01-01	38.3567000000000000
2005-01-01	40.3421000000000000
2006-01-01	55.8129000000000000
2007-01-01	65.0767000000000000
2008-01-01	65.3230000000000100
2009-01-01	78.9329000000000000
2010-01-01	77.2057000000000000
2011-01-01	74.5056000000000000
2012-01-01	86.8938000000000000
2013-01-01	86.3148000000000000
2014-01-01	74.6058000000000000
2015-01-01	76.4722000000000000
2016-01-01	66.5700000000000000