เปอร์เซ็นต์ของผู้ใช้ที่ใช้ Netscape ในช่วงที่ 63.67% ใช้ Internet Explorer คืออะไร
What percentage of users were using Netscape during the period in which 63.67% were using Internet Explorer?
df = pd.DataFrame(columns=['netscape', 'internet_explorer'])
df[df['internet_explorer'] == '63.67%']['netscape']