通货膨胀率计算

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    url = '____'
    df = pd.read_csv(____)
    annual = df.groupby(____)['____'].mean()
    inflation = annual.pct_change()*____
    inflation = inflation.dropna()
    print(____)
    print(____)
    plt.figure(figsize=(____,____))
    plt.plot(____)
    plt.axhline(____, color='____', ls='____')
    plt.xlabel(____); plt.ylabel(____); plt.title(____)
    plt.tight_layout(); plt.show()