Year	Percent
1971-01-01	0.3351200000000000
1972-01-01	0.2626920000000000
1973-01-01	1.1207799999999999
1974-01-01	1.5657200000000000
1975-01-01	1.6819200000000000
1976-01-01	1.3435500000000000
1977-01-01	1.9784400000000002
1978-01-01	1.4469000000000000
1979-01-01	1.1542200000000000
1980-01-01	0.8835219999999999
1981-01-01	0.9563550000000000
1982-01-01	1.0684000000000000
1983-01-01	1.2572299999999998
1984-01-01	1.3040300000000000
1985-01-01	1.1484700000000000
1986-01-01	1.2927400000000000
1987-01-01	2.0583700000000000
1988-01-01	2.3079200000000000
1989-01-01	2.2067000000000000
1990-01-01	2.0603599999999997
1991-01-01	2.0042800000000000
1992-01-01	2.0772500000000000
1993-01-01	5.1747400000000000
1994-01-01	9.0831400000000000
1995-01-01	9.0001600000000010
1996-01-01	9.6201300000000000
1997-01-01	12.5603000000000000
1998-01-01	12.4847000000000000
1999-01-01	14.5354000000000000
2000-01-01	17.0736000000000000
2001-01-01	22.1631000000000000
2002-01-01	23.9412000000000000
2003-01-01	29.7755000000000000
2004-01-01	29.5447000000000000
2005-01-01	30.5871000000000000
2006-01-01	31.8638000000000000
2007-01-01	30.9805000000000000
2008-01-01	30.4360000000000000
2009-01-01	36.2043000000000000
2010-01-01	37.1903000000000000
2011-01-01	34.3494000000000000
2012-01-01	43.1688000000000000
2013-01-01	43.6479000000000000
2014-01-01	45.3809000000000000
2015-01-01	42.0059000000000000
2016-01-01	44.1488000000000000