Python 将pyplot地物x轴值从最早排序到最新排序

我有这个数字，但我想从最老的到最新的订单。目前它是按大小从大到小订购的

Bosten_all["OCCURRED_ON_DATE"] = pd.to_datetime(Bosten_all["OCCURRED_ON_DATE"])
Bosten_all["month"]=Bosten_all['OCCURRED_ON_DATE'].dt.year
warnings.filterwarnings('ignore')
color = plt.cm.twilight(np.linspace(0, 5, 100))
Bosten_all["month"].value_counts().head(20).plot.bar(color = color, figsize = (15, 9))
plt.title('Distribution of crime by each month in Bosten ', fontsize = 20)
plt.show()