Year	Percent
1980-01-01	0.7281569999999999
1981-01-01	0.6579729999999999
1982-01-01	1.0251400000000000
1983-01-01	1.5831000000000000
1984-01-01	2.4346500000000000
1985-01-01	4.6851500000000000
1986-01-01	7.9488100000000010
1987-01-01	14.5203000000000000
1988-01-01	14.2882000000000000
1989-01-01	15.1501000000000000
1990-01-01	16.7499000000000000
1991-01-01	17.4339000000000000
1992-01-01	17.2861000000000000
1993-01-01	15.3672000000000000
1994-01-01	14.7971000000000000
1995-01-01	15.4216000000000000
1996-01-01	15.7441000000000000
1997-01-01	14.7451000000000000
1998-01-01	17.5595000000000000
1999-01-01	19.2616000000000000
2000-01-01	23.2066000000000000
2001-01-01	26.0506000000000000
2002-01-01	27.8268000000000000
2003-01-01	31.0801000000000000
2004-01-01	35.2271000000000000
2005-01-01	35.6683000000000000
2006-01-01	46.8796000000000000
2007-01-01	46.5128000000000000
2008-01-01	41.7754000000000000
2009-01-01	51.1952000000000000
2010-01-01	43.3521000000000000
2011-01-01	36.2858000000000000
2012-01-01	37.8232000000000000
2013-01-01	41.0960000000000040
2014-01-01	42.1794000000000000
2015-01-01	49.1401000000000000
2016-01-01	48.3721000000000000