#df4 = pd.read_sql('''SELECT max(emission)emission, year, code FROM CO_DEUX WHERE code NOT LIKE 'OWID_WRL' GROUP BY year, code,emission HAVING emission = max(emission) ORDER BY year;''',con=co)
df4=pd.read_sql('''SELECT max(emission)emission, year, code FROM CO_DEUX WHERE code NOT LIKE 'OWID_WRL' GROUP BY year, code,emission HAVING emission = max(emission) ORDER BY year;''',con=co)