You can search for End of Month Basic Exchange Rate after choosing the currency and the date.
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20242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999199819971996 010203040506070809101112 ~ 20242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999199819971996 010203040506070809101112