Year	Percent
1999-01-01	3.02718543595638
2000-01-01	2.48397483343994
2001-01-01	2.48431535145997
2002-01-01	2.45227845318762
2003-01-01	2.88783427479606
2004-01-01	2.96722294049915
2005-01-01	2.58873710032216
2006-01-01	2.10092555643631
2007-01-01	2.03667992766870
2008-01-01	1.84907575813271
2009-01-01	3.20878747403450
2010-01-01	3.93812624867185
2011-01-01	3.97861246147455
2012-01-01	3.91727195980865
2013-01-01	3.60503167016955
2014-01-01	3.39618441699442