บริษัทใดมีการเพิ่มขึ้นของอัตราส่วนหนี้สินต่อทุนมากที่สุดจากปี 2021 ถึง 2022?
Which companies will see the biggest increase in debt-to-equity ratio from 2021 to 2022?
de_ratio_increase_2021_2022 = pd.merge(data_2021[['Company', 'Debt/Equity Ratio']], data_2022[['Company', 'Debt/Equity Ratio']], on='Company', suffixes=('_2021', '_2022'))
de_ratio_increase_2021_2022['DE Ratio Increase'] = de_ratio_increase_2021_2022['Debt/Equity Ratio_2022'] - de_ratio_increase_2021_2022['Debt/Equity Ratio_2021']
highest_de_increase_company = de_ratio_increase_2021_2022[de_ratio_increase_2021_2022['DE Ratio Increase'] == de_ratio_increase_2021_2022['DE Ratio Increase'].max()]