class_docstr: Historic Employment in UK Coal Mines
  
  This is historic data obtained from the UK government.
      We use the employment column for the number of workers employed in the British coal mines
      Missing values in the data are replaced with the value of the preceding year.
  
  References
  ----------
  [^1]: https://www.gov.uk/government/statistical-data-sets/historical-coal-data-coal-production-availability-and-consumption
code: def __init__(self):
      super().__init__(
          annotations={
              "6": [15, 28, 45, 60, 68, 80],
              "7": [18, 47, 81],
              "8": [],
              "9": [15, 27, 46, 68, 81],
              "13": [19, 28, 45, 68, 80],
          },
          filename="uk_coal_employment.csv",
          task=datasets.base.REG,
          n_samples=105,
          n_features=1,
      )
  
imports: from __future__ import annotations
  from river import datasets, stream
  from .base import ChangePointFileDataset
label_desc: Use image node_id 1 to create a new UKCoalEmploy object from inherited base classes: ChangePointFileDataset with example: obj = UKCoalEmploy()