This function returns a list of data frames with MONTH and year columns based on data in "accident_<year>.csv.bz2 files. The files need to be located in the working directory.
A vector or list of years in numeric or integer format.
a list of tibbles with the same number of rows as the data in "accident_<year>.csv.bz2" files and two columns - MONTH and year. NULL value if year is invalid (also a warning will be raised).
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