NastyFans gathers a daily exchange rate from multiple sources to use for statistical conversion data on charts. This information is posted publicly so that anyone may utilize it and dates all the way back to July of 2009! Enjoy!
https://nastyfans.org/exchangerate.csvdate,value
2010-07-18,0.09
2010-07-19,0.08
2010-07-20,0.07
2010-07-21,0.08
…
2020-06-06,9679.75
2020-06-07,9621.55
2020-06-08,9730.365
2020-06-09,9730.365