折线图消费时间序列趋势

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    url = '____'
    df = pd.read_csv(____).sort_values(____)
    annual_growth = (____)/(len(____)-____)
    print(____)
    plt.figure(figsize=(____,____))
    plt.plot(____)
    plt.xlabel(____); plt.ylabel(____); plt.title(____)
    plt.tight_layout(); plt.show()