บริษัทใดมีการเปลี่ยนแปลงจำนวนพนักงานมากที่สุดจากปี 2021 ถึง 2022?
 Which companies will see the biggest change in headcount from 2021 to 2022?
data_2021_2022_merged = pd.merge(data_2021[['Company', 'Number of Employees']], data_2022[['Company', 'Number of Employees']], on='Company', suffixes=('_2021', '_2022'))
data_2021_2022_merged['Employee Change'] = data_2021_2022_merged['Number of Employees_2022'] - data_2021_2022_merged['Number of Employees_2021']
highest_employee_change = data_2021_2022_merged[data_2021_2022_merged['Employee Change'] == data_2021_2022_merged['Employee Change'].max()]