这是由联邦储备经济数据库（FRED）托管的圣路易斯联邦储备银行的数据集。 nber-based-recession-indicators-for-the-united-states-from-the-peak-through-the-trough_metadata.json nber-based-recession-indicators-for-the-united-states-from-the-period-following-the-peak-through-the-trough_me