Year	Percent
1989-01-01	7.1590300000000004
1990-01-01	11.2833000000000000
1991-01-01	42.9894000000000000
1992-01-01	67.5103000000000000
1993-01-01	68.1323000000000000
1994-01-01	70.3442000000000000
1995-01-01	75.1687000000000000
1996-01-01	73.8107000000000000
1997-01-01	70.1665000000000000
1998-01-01	63.9602000000000000
1999-01-01	53.5829000000000000
2000-01-01	49.4221000000000000
2001-01-01	52.3213000000000000
2002-01-01	47.1923000000000000
2003-01-01	37.2688000000000000
2004-01-01	34.2094000000000000
2005-01-01	38.7694000000000000
2006-01-01	38.5417000000000000
2007-01-01	33.7790000000000000
2008-01-01	41.5988000000000000
2009-01-01	61.0006000000000000
2010-01-01	70.9868000000000000