Why is the baseline mean and median additions and removals data based on 2019 calendar year in the HSEView Demand & Capacity component?

2019 calendar data was chosen to avoid the unusual additions/removals patterns associated with COVID-19-affected periods.

COVID-19 caused big decreases in the additions and removals during various windows across 2020 and early 2021, therefore these periods are unlikely to ever be usable as a benchmark for 'normal' activity. In addition, mid-2021 was also impacted by a significant data incident. This baseline will be reviewed in the future.