import pandas as pd
import matplotlib.pyplot as plt
# 設定中文字型及負號正確顯示
plt.rcParams["font.sans-serif"] = "Microsoft JhengHei"  #也可設mingliu或DFKai-SB
plt.rcParams["axes.unicode_minus"] = False 

df = pd.DataFrame([[250,320,300,312,280],
                   [280,300,280,290,310],
                   [220,280,250,305,250]],
                   index=['北部','中部','南部'],
                   columns=[2015,2016,2017,2018,2019])
df.plot(kind='pie', subplots=True, figsize=[20,20])