数据来自Bureau of Economic Analysis。
部分数据在sheet2中。
包含内容有：    Gross domestic product
Personal consumption expenditures
  Goods
    Durable goods
    Nondurable goods
  Services
Gross private domestic investment
  Fixed investment
    Nonresidential
      Structures
      Equipment
      Intellectual property products
    Residential
  Change in private inventories
Net exports of goods and services
  Exports
    Goods
    Services
  Imports
    Goods
    Services
Government consumption expenditures and gross investment
  Federal
    National defense
    Nondefense
  State and local