รัสเซียใช้ยูเรเนียมเท่าใดในปี 2549 ถึง 2551
How much uranium did Russia use in 2006 to 2008?
df = pd.DataFrame(columns=['uranium_required_2006_08', 'country'])
df.loc[df['country'] == 'Russia', 'uranium_required_2006_08']