Year	Percent
1980-01-01	3.0779400000000003
1981-01-01	3.9833500000000000
1982-01-01	4.2251300000000000
1983-01-01	4.5675099999999995
1984-01-01	5.1800300000000000
1985-01-01	6.4973000000000000
1986-01-01	6.5149099999999995
1987-01-01	8.0394399999999990
1988-01-01	9.1951800000000000
1989-01-01	10.9654000000000000
1990-01-01	9.5321199999999990
1991-01-01	8.6187899999999990
1992-01-01	7.5600100000000010
1993-01-01	5.7466400000000000
1994-01-01	6.0360600000000000
1995-01-01	5.6033400000000000
1996-01-01	5.5457800000000010
1997-01-01	5.9532700000000000
1998-01-01	6.7961899999999990
1999-01-01	7.3457200000000000
2000-01-01	8.6492399999999990
2001-01-01	10.6379000000000000
2002-01-01	11.9713000000000000
2003-01-01	15.9921000000000000
2004-01-01	17.5242000000000000
2005-01-01	21.2987000000000000
2006-01-01	27.0291000000000000
2007-01-01	35.0245000000000000
2008-01-01	36.0523000000000000
2009-01-01	47.0789000000000000
2010-01-01	42.9351000000000000
2011-01-01	40.0437000000000000
2012-01-01	46.6508000000000000
2013-01-01	44.3181000000000000
2014-01-01	38.7583000000000000
2015-01-01	44.3009000000000000
2016-01-01	44.4021000000000000