The deme of Y kept its population at 6953 until 9069.7912 generations ago, when a exponential reduction ensued until 3583.3, to size 3213. Subsequently, a exponential change changed the numbers to 701 individuals by 2727.3. Starting from 2727.3, the population has seen a change from 701 to 4643 at a exponential pace, continuing to this day.
time_units: generations
demes:
  - name: Y
    start_time: .inf
    epochs:
      - start_size: 6953
        end_time: 9069.7912
      - start_size: 6953
        end_size: 3213
        end_time: 3583.3
        size_function: exponential
      - start_size: 3213
        end_time: 2727.3
        end_size: 701
        size_function: exponential
      - end_time: 0
        start_size: 701
        end_size: 4643
        size_function: exponential