Historic rates for VND are wrong

[mbergen]

Starting with 2019-11-08, the conversion rates VND-USD are wrong, by factor 100: https://api.exchangerate.host/2019-11-08?base=VND&symbols=USD gives 0.004222

Expected value would be closer to the one from 2019-11-07: https://api.exchangerate.host/2019-11-07?base=VND&symbols=USD gives 0.000044

Following dates are even worse, up to 1.1022 on 2019-11-11, goes back to expected 0.000044 on 2019-11-12 though.