Year	Percent
1990-01-01	6.238550000000000
1991-01-01	7.186780000000001
1992-01-01	7.048290000000000
1993-01-01	7.388910000000001
1994-01-01	8.837220000000000
1995-01-01	10.654200000000000
1996-01-01	12.996400000000000
1997-01-01	14.854200000000000
1998-01-01	17.394100000000000
1999-01-01	19.369100000000000
2000-01-01	20.799100000000000
2001-01-01	22.480500000000000
2002-01-01	24.679000000000002
2003-01-01	28.222200000000000
2004-01-01	28.917900000000000
2005-01-01	26.572100000000000
2006-01-01	26.927800000000000
2007-01-01	35.982100000000000
2008-01-01	43.533700000000000
2009-01-01	50.486200000000000
2010-01-01	59.686000000000010
2011-01-01	69.460900000000000