Year	Percent
1987-01-01	1.156961
1988-01-01	3.321320
1989-01-01	1.465201
1990-01-01	7.347401
1991-01-01	12.661320
1992-01-01	6.309899
1993-01-01	14.722360
1994-01-01	13.496430
1995-01-01	10.931920
1996-01-01	11.612420
1997-01-01	6.921649
1998-01-01	31.749600
1999-01-01	45.782250
2000-01-01	61.921390
2001-01-01	72.735020
2002-01-01	66.595080
2003-01-01	35.996440
2004-01-01	31.663190
2005-01-01	38.125480
2006-01-01	52.121920
2007-01-01	67.073240
2008-01-01	74.256200
2009-01-01	133.250000
2010-01-01	188.131500