Quarter	National Currency
1989-01-01	12.49
1989-04-01	12.44
1989-07-01	12.49
1989-10-01	12.45
1990-01-01	13.13
1990-04-01	13.35
1990-07-01	13.22
1990-10-01	13.26
1991-01-01	13.59
1991-04-01	13.77
1991-07-01	13.56
1991-10-01	13.72
1992-01-01	13.94
1992-04-01	14.03
1992-07-01	13.72
1992-10-01	13.85
1993-01-01	14.04
1993-04-01	14.02
1993-07-01	13.82
1993-10-01	13.94
1994-01-01	14.07
1994-04-01	14.26
1994-07-01	14.19
1994-10-01	14.19
1995-01-01	14.42
1995-04-01	14.53
1995-07-01	14.51
1995-10-01	14.68
1996-01-01	14.94
1996-04-01	15.02
1996-07-01	14.99
1996-10-01	15.19
1997-01-01	15.41
1997-04-01	15.57
1997-07-01	15.52
1997-10-01	15.71
1998-01-01	15.83
1998-04-01	15.98
1998-07-01	15.98
1998-10-01	16.18
1999-01-01	16.33
1999-04-01	16.40
1999-07-01	16.39
1999-10-01	16.50
2000-01-01	16.77
2000-04-01	16.83
2000-07-01	16.85
2000-10-01	17.04
2001-01-01	17.27
2001-04-01	17.33
2001-07-01	17.46
2001-10-01	17.55
2002-01-01	17.87
2002-04-01	18.04
2002-07-01	17.91
2002-10-01	18.30
2003-01-01	18.27
2003-04-01	18.53
2003-07-01	18.69
2003-10-01	18.73
2004-01-01	18.84
2004-04-01	19.18
2004-07-01	19.04
2004-10-01	19.26
2005-01-01	19.39
2005-04-01	19.61
2005-07-01	19.93
2005-10-01	20.12
2006-01-01	20.33
2006-04-01	20.62
2006-07-01	20.82
2006-10-01	20.89
2007-01-01	21.28
2007-04-01	21.48
2007-07-01	21.50
2007-10-01	21.96
2008-01-01	22.29
2008-04-01	22.64
2008-07-01	22.50
2008-10-01	22.69
2009-01-01	22.83
2009-04-01	23.25
2009-07-01	23.38
2009-10-01	23.26
2010-01-01	23.68
2010-04-01	23.90
2010-07-01	24.04
2010-10-01	24.25
2011-01-01	24.53
2011-04-01	24.75
2011-07-01	25.10
2011-10-01	25.11
2012-01-01	25.56
2012-04-01	25.55
2012-07-01	25.99
2012-10-01	25.88
2013-01-01	26.41
2013-04-01	26.25
2013-07-01	26.43
2013-10-01	26.52
2014-01-01	26.90
2014-04-01	27.17
2014-07-01	27.50
2014-10-01	27.16
2015-01-01	27.40
2015-04-01	27.92
2015-07-01	28.21
2015-10-01	28.25
2016-01-01	28.37
2016-04-01	28.35
2016-07-01	28.67
2016-10-01	28.71
2017-01-01	29.22
2017-04-01	28.47
2017-07-01	29.11
2017-10-01	29.24
2018-01-01	29.53
2018-04-01	29.37
2018-07-01	29.92