Quarter	National Currency
1989-01-01	12.19
1989-04-01	12.24
1989-07-01	12.35
1989-10-01	12.60
1990-01-01	13.10
1990-04-01	13.21
1990-07-01	13.31
1990-10-01	13.48
1991-01-01	13.64
1991-04-01	13.72
1991-07-01	13.76
1991-10-01	13.86
1992-01-01	13.97
1992-04-01	14.04
1992-07-01	13.97
1992-10-01	14.03
1993-01-01	14.04
1993-04-01	14.12
1993-07-01	14.04
1993-10-01	14.11
1994-01-01	14.23
1994-04-01	14.39
1994-07-01	14.40
1994-10-01	14.41
1995-01-01	14.53
1995-04-01	14.69
1995-07-01	14.77
1995-10-01	14.86
1996-01-01	15.03
1996-04-01	15.24
1996-07-01	15.29
1996-10-01	15.41
1997-01-01	15.61
1997-04-01	15.74
1997-07-01	15.83
1997-10-01	15.90
1998-01-01	15.99
1998-04-01	16.14
1998-07-01	16.22
1998-10-01	16.35
1999-01-01	16.40
1999-04-01	16.49
1999-07-01	16.68
1999-10-01	16.56
2000-01-01	16.70
2000-04-01	16.75
2000-07-01	16.89
2000-10-01	16.98
2001-01-01	17.20
2001-04-01	17.35
2001-07-01	17.48
2001-10-01	17.51
2002-01-01	17.62
2002-04-01	17.60
2002-07-01	17.91
2002-10-01	18.09
2003-01-01	18.07
2003-04-01	18.34
2003-07-01	18.45
2003-10-01	18.57
2004-01-01	18.60
2004-04-01	19.15
2004-07-01	19.10
2004-10-01	18.98
2005-01-01	19.18
2005-04-01	19.55
2005-07-01	19.80
2005-10-01	19.94
2006-01-01	20.06
2006-04-01	20.52
2006-07-01	20.91
2006-10-01	21.03
2007-01-01	21.18
2007-04-01	21.39
2007-07-01	21.68
2007-10-01	21.87
2008-01-01	22.10
2008-04-01	22.56
2008-07-01	22.80
2008-10-01	23.00
2009-01-01	23.24
2009-04-01	23.42
2009-07-01	23.57
2009-10-01	23.48
2010-01-01	23.40
2010-04-01	23.53
2010-07-01	23.77
2010-10-01	23.91
2011-01-01	23.97
2011-04-01	24.28
2011-07-01	24.58
2011-10-01	24.58
2012-01-01	24.90
2012-04-01	24.96
2012-07-01	25.31
2012-10-01	25.23
2013-01-01	25.49
2013-04-01	25.53
2013-07-01	25.93
2013-10-01	26.00
2014-01-01	26.21
2014-04-01	26.31
2014-07-01	26.71
2014-10-01	26.79
2015-01-01	26.84
2015-04-01	27.17
2015-07-01	27.40
2015-10-01	27.47
2016-01-01	27.54
2016-04-01	27.78
2016-07-01	27.87
2016-10-01	27.80
2017-01-01	27.89
2017-04-01	28.12
2017-07-01	28.44
2017-10-01	28.68
2018-01-01	29.01
2018-04-01	29.07
2018-07-01	29.43