Quarter	National Currency
2002-01-01	2.22
2002-04-01	2.26
2002-07-01	2.23
2002-10-01	2.38
2003-01-01	2.45
2003-04-01	2.55
2003-07-01	2.45
2003-10-01	2.62
2004-01-01	2.61
2004-04-01	2.72
2004-07-01	2.68
2004-10-01	2.79
2005-01-01	2.90
2005-04-01	3.02
2005-07-01	2.93
2005-10-01	3.23
2006-01-01	3.30
2006-04-01	3.54
2006-07-01	3.48
2006-10-01	3.85
2007-01-01	3.96
2007-04-01	4.25
2007-07-01	4.27
2007-10-01	4.63
2008-01-01	4.78
2008-04-01	5.00
2008-07-01	4.87
2008-10-01	5.09
2009-01-01	4.89
2009-04-01	4.93
2009-07-01	4.59
2009-10-01	4.75
2010-01-01	4.76
2010-04-01	4.85
2010-07-01	4.60
2010-10-01	4.83
2011-01-01	4.87
2011-04-01	5.08
2011-07-01	4.82
2011-10-01	5.19
2012-01-01	5.16
2012-04-01	5.28
2012-07-01	5.21
2012-10-01	5.53
2013-01-01	5.63
2013-04-01	5.71
2013-07-01	5.58
2013-10-01	5.99
2014-01-01	6.02
2014-04-01	6.21
2014-07-01	5.89
2014-10-01	6.35
2015-01-01	6.37
2015-04-01	6.61
2015-07-01	6.28
2015-10-01	6.67
2016-01-01	6.86
2016-04-01	6.91
2016-07-01	6.62
2016-10-01	7.08
2017-01-01	7.13
2017-04-01	7.50
2017-07-01	7.22
2017-10-01	7.67
2018-01-01	7.38
2018-04-01	7.50