Year	Ratio
1996-01-01	2.27381992340088
1997-01-01	2.22949004173279
1998-01-01	2.14242005348206
1999-01-01	1.85774004459381
2000-01-01	1.78630995750427
2001-01-01	1.75762999057770
2002-01-01	1.78083002567291
2003-01-01	1.73133003711700
2004-01-01	1.68506002426147
2005-01-01	1.65288996696472
2006-01-01	1.59156000614166
2007-01-01	1.56484997272491
2008-01-01	1.57823002338409
2009-01-01	1.55373001098633
2010-01-01	1.53515005111694
2011-01-01	1.48919999599457
2012-01-01	1.44228994846344
2013-01-01	1.42316997051239
2014-01-01	1.43516004085541
2015-01-01	1.38268995285034
2016-01-01	1.39269995689392