Year	Percent
1999-12-31	3.3388
2000-12-31	4.8544
2001-12-31	3.3
2002-12-31	2.8613
2003-12-31	2.123
2004-12-31	2.1544
2005-12-31	2.4866
2006-12-31	3.7231
2007-12-31	4.6788
2008-12-31	2.8938
2009-12-31	0.655
2010-12-31	0.9388
2011-12-31	1.2921
2012-12-31	0.1286
2013-12-31	0.2657
2014-12-31	0.0586
2015-12-31	0.1279
2016-12-31	0.3364
2017-12-31	0.3847
2018-12-31	0.3557
2019-12-31	0.4143
2020-12-31	0.5663