Year	Ratio
1981-01-01	1.15929996967316
1982-01-01	1.17411005496979
1983-01-01	1.12162995338440
1984-01-01	1.03577995300293
1985-01-01	1.06052994728088
1986-01-01	1.12425994873047
1987-01-01	1.16050004959106
1988-01-01	1.17417001724243
1989-01-01	1.19194996356964
1990-01-01	1.21124005317688
1991-01-01	1.25067996978760
1992-01-01	1.12513005733490
1993-01-01	1.21226000785828
1994-01-01	1.26189005374908
1995-01-01	1.33958005905151
1996-01-01	1.35520005226135
1997-01-01	1.34898996353149
1998-01-01	1.31147003173828
1999-01-01	1.36196005344391
2000-01-01	1.36739003658295
2001-01-01	1.36577999591827
2002-01-01	1.43921995162964
2003-01-01	1.35185003280640
2004-01-01	1.37661004066467
2005-01-01	1.42376005649567
2006-01-01	1.45529997348785
2007-01-01	1.46508002281189
2008-01-01	1.47403001785278
2009-01-01	1.48022997379303
2010-01-01	1.48503005504608
2011-01-01	1.67250001430511
2012-01-01	1.47412002086639
2013-01-01	1.44956004619598
2014-01-01	1.44888997077942
2015-01-01	1.46501994132996