urfu-python 3.2.1 2007.csv 2008.csv 2009.csv 2010.csv 2011.csv 2012.csv 2013.csv 2014.csv 2015.csv 2016.csv 2017.csv 2018.csv 2019.csv 2020.csv 2021.csv 2022.csv 3.3.1 currencies_df.csv 3.3.2 convert_100.csv