Year	Percent
1987-01-01	0.2235266
1988-01-01	0.2416589
1989-01-01	0.3208047
1990-01-01	0.2713295
1991-01-01	0.4541344
2002-01-01	1.9665010
2003-01-01	1.9843000
2004-01-01	2.4394140
2005-01-01	2.7760610
2006-01-01	3.1183180
2007-01-01	3.1868390
2008-01-01	2.2489450
2009-01-01	3.1280880
2010-01-01	3.0583450