+years = {}
+for filename in glob.glob('yob*.txt'):
+ year = re.match(r'yob(\d{4})\.txt$', filename).group(1)
+ tmp_boys, tmp_girls = import_yob_file(filename)
+ years[year] = {'girls' : tmp_girls,
+ 'boys' : tmp_boys}
+
+## resort by year
+years = dict(sorted(years.items()))
+
+girls = years["2021"]["girls"]
+boys = years["2021"]["boys"]
+
+
+
+