This function calls fars_read_years to read files in "accident_'year'.csv.bz2" form and
outputs a tibble with column 'MONTH' and 'year' first. Then it unlists (MONTH, year) pairs,
groups them, and counts their numbers. Finally, it "reshapes" the output as a tibble
with "MONTH", "years" form where "years" is the list in the input.
You can input the year using
The years in list you want to process
a tibble with columns 'MONTH' and 'years'
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