Year	Percent
1990-01-01	2.3382900000000000
1991-01-01	3.4287900000000002
1992-01-01	8.9698000000000000
1993-01-01	18.4503000000000000
1994-01-01	24.0802000000000000
1995-01-01	24.4485000000000000
1996-01-01	26.9204000000000000
1997-01-01	28.4458000000000000
1998-01-01	30.1577000000000000
1999-01-01	32.3810000000000000
2000-01-01	32.9026000000000000
2001-01-01	35.9550000000000000
2002-01-01	39.6777000000000000
2003-01-01	43.3885000000000000
2004-01-01	44.8899000000000000
2005-01-01	42.1077000000000000
2006-01-01	41.6269000000000000
2007-01-01	47.3408000000000000
2008-01-01	45.0448000000000000
2009-01-01	50.0698000000000000
2010-01-01	40.3980000000000000
2011-01-01	29.2008000000000000
2012-01-01	44.6010000000000060
2013-01-01	47.7103000000000000
2014-01-01	45.6710000000000100
2015-01-01	50.1875000000000000
2016-01-01	53.1602000000000000