Quarter	National Currency
1981-01-01	1.96956216342777
1981-04-01	2.40286583938188
1981-07-01	2.95434324514165
1981-10-01	2.69830016389604
1982-01-01	2.33393116366191
1982-04-01	2.77708265043315
1982-07-01	3.25962538047296
1982-10-01	3.22023413720440
1983-01-01	2.64906110981035
1983-04-01	3.09221259658160
1983-07-01	3.88003746195270
1983-10-01	3.66338562397565
1984-01-01	2.97403886677593
1984-04-01	3.43688597518146
1984-07-01	4.26410208382112
1984-10-01	4.03760243502692
1985-01-01	3.41719035354718
1985-04-01	3.94897213767268
1985-07-01	4.60877546242098
1985-10-01	4.37242800280965
1986-01-01	3.96866775930695
1986-04-01	4.32318894872395
1986-07-01	5.15040505736362
1986-10-01	4.78603605712948
1987-01-01	4.14592835401545
1987-04-01	4.81557948958089
1987-07-01	5.44583938187778
1987-10-01	5.29812221962070
1988-01-01	4.39212362444392
1988-04-01	5.03223132755795
1988-07-01	5.80036057129478
1988-10-01	5.71173027394053
1989-01-01	4.72694919222664
1989-04-01	5.32766565207211
1989-07-01	6.10564270662608
1989-10-01	6.11549051744322
1990-01-01	5.15040505736362
1990-04-01	5.80036057129478
1990-07-01	6.63742449075158
1990-10-01	6.62757667993444
1991-01-01	5.60340435495200
1991-04-01	6.38138140950597
1991-07-01	7.32677124795130
1991-10-01	7.27753219386560
1992-01-01	6.08594708499180
1992-04-01	6.86392413954577
1992-07-01	7.93733551861391
1992-10-01	7.87824865371108
1993-01-01	6.54879419339733
1993-04-01	7.29722781549988
1993-07-01	8.55774760009365
1993-10-01	8.44942168110513
1994-01-01	6.94270662608288
1994-04-01	7.61235776164833
1994-07-01	8.78424724888785
1994-10-01	8.69561695153360
1995-01-01	7.18890189651136
1995-04-01	7.97672676188246
1995-07-01	9.16831187075626
1995-10-01	9.13876843830484
1996-01-01	7.63205338328260
1996-04-01	8.48881292437368
1996-07-01	9.69024584406462
1996-10-01	9.64100678997893
1997-01-01	7.97672676188246
1997-04-01	8.94181222196207
1997-07-01	10.07431046593300
1997-10-01	10.04476703348160
1998-01-01	8.24261765394521
1998-04-01	9.21755092484196
1998-07-01	10.44852727698430
1998-10-01	10.35989697963010
1999-01-01	8.46911730273941
1999-04-01	9.50313743853898
1999-07-01	10.68487473659560
1999-10-01	10.62578787169280
2000-01-01	8.72516038398502
2000-04-01	9.74933270896746
2000-07-01	11.03939592601260
2000-10-01	10.89167876375560
2001-01-01	9.03000000000000
2001-04-01	10.17000000000000
2001-07-01	11.41000000000000
2001-10-01	11.45000000000000
2002-01-01	9.82000000000000
2002-04-01	10.42000000000000
2002-07-01	12.00000000000000
2002-10-01	11.96000000000000
2003-01-01	10.16000000000000
2003-04-01	11.40000000000000
2003-07-01	12.52000000000000
2003-10-01	12.34000000000000
2004-01-01	10.61000000000000
2004-04-01	11.51000000000000
2004-07-01	12.73000000000000
2004-10-01	13.13000000000000
2005-01-01	11.35000000000000
2005-04-01	11.74000000000000
2005-07-01	13.28000000000000
2005-10-01	13.63000000000000
2006-01-01	11.36000000000000
2006-04-01	12.63000000000000
2006-07-01	13.81000000000000
2006-10-01	14.26000000000000
2007-01-01	11.94000000000000
2007-04-01	13.15000000000000
2007-07-01	14.42000000000000
2007-10-01	14.85000000000000
2008-01-01	13.13000000000000
2008-04-01	13.33000000000000
2008-07-01	15.20000000000000
2008-10-01	15.30000000000000
2009-01-01	13.35000000000000
2009-04-01	14.62000000000000
2009-07-01	15.76000000000000
2009-10-01	16.05000000000000
2010-01-01	13.70000000000000
2010-04-01	14.74000000000000
2010-07-01	15.71000000000000
2010-10-01	16.46000000000000
2011-01-01	13.75000000000000
2011-04-01	15.12000000000000
2011-07-01	16.45000000000000
2011-10-01	16.93000000000000
2012-01-01	14.05000000000000
2012-04-01	15.59000000000000
2012-07-01	16.67000000000000
2012-10-01	17.07000000000000
2013-01-01	14.72000000000000
2013-04-01	15.44000000000000
2013-07-01	16.90000000000000
2013-10-01	17.24000000000000
2014-01-01	14.49000000000000
2014-04-01	16.15000000000000
2014-07-01	16.95000000000000
2014-10-01	17.15000000000000
2015-01-01	14.64000000000000
2015-04-01	16.06000000000000
2015-07-01	16.88000000000000
2015-10-01	17.33000000000000
2016-01-01	15.23000000000000
2016-04-01	15.43000000000000
2016-07-01	16.88000000000000
2016-10-01	17.58000000000000
2017-01-01	14.61000000000000
2017-04-01	16.22000000000000
2017-07-01	16.88000000000000
2017-10-01	17.83000000000000
2018-01-01	15.07000000000000
2018-04-01	15.85000000000000