[
  {
    "year": 2015,
    "iowa_thousands": 6.6,
    "michigan_thousands": 20.3,
    "pennsylvania_thousands": 24.3
  },
  {
    "year": 2016,
    "iowa_thousands": 6.5,
    "michigan_thousands": 20.5,
    "pennsylvania_thousands": 24.1
  },
  {
    "year": 2017,
    "iowa_thousands": 6.5,
    "michigan_thousands": 20.7,
    "pennsylvania_thousands": 23.9
  },
  {
    "year": 2018,
    "iowa_thousands": 6.5,
    "michigan_thousands": 20.7,
    "pennsylvania_thousands": 23.7
  },
  {
    "year": 2019,
    "iowa_thousands": 6.3,
    "michigan_thousands": 21.1,
    "pennsylvania_thousands": 23.4
  },
  {
    "year": 2020,
    "iowa_thousands": 6.2,
    "michigan_thousands": 20.6,
    "pennsylvania_thousands": 22.6
  },
  {
    "year": 2021,
    "iowa_thousands": 6,
    "michigan_thousands": 21.1,
    "pennsylvania_thousands": 22.3
  },
  {
    "year": 2022,
    "iowa_thousands": 5.7,
    "michigan_thousands": 22,
    "pennsylvania_thousands": 22.2
  },
  {
    "year": 2023,
    "iowa_thousands": 5.9,
    "michigan_thousands": 20.7,
    "pennsylvania_thousands": 22.8
  },
  {
    "year": 2024,
    "iowa_thousands": 5.9,
    "michigan_thousands": 19.9,
    "pennsylvania_thousands": 22.8
  },
  {
    "year": 2025,
    "iowa_thousands": 5.6,
    "michigan_thousands": 20.1,
    "pennsylvania_thousands": 23.1
  },
  {
    "year": 2026,
    "iowa_thousands": 5.6,
    "michigan_thousands": 20.9,
    "pennsylvania_thousands": 23
  }
]