บริษัทใดมีการลดอัตราส่วนหนี้สินต่อทุนมากที่สุดจากปี 2021 ถึง 2022?
Which companies have reduced their debt-to-equity ratios the most from 2021 to 2022?
de_ratio_change_2021_2022 = pd.merge(data_2021[['Company', 'Debt/Equity Ratio']], data_2022[['Company', 'Debt/Equity Ratio']], on='Company', suffixes=('_2021', '_2022'))
de_ratio_change_2021_2022['DE Ratio Change'] = de_ratio_change_2021_2022['Debt/Equity Ratio_2021'] - de_ratio_change_2021_2022['Debt/Equity Ratio_2022']
most_significant_decrease_de_company = de_ratio_change_2021_2022[de_ratio_change_2021_2022['DE Ratio Change'] == de_ratio_change_2021_2022['DE Ratio Change'].max()]