How is the 'Increase in Patients Waiting Over Target in the Last 6 Months' (Column 'C') data calculated in the HSEView Demand & Capacity component?

The Increase in Patients Waiting Over Target in the Last 6 months shows the difference between the current Over Target position (column B), and its position 6 months ago. 

The percentage increase is also provided, to show the extent that the backlog of over target patients is increasing. The distribution of this across the hospitals within Hospital Group is provided.

This information is provided to measure the increases in over target positions with waiting list addition and removals balances.

NOTE: If a hospital has had zero Over Target Patients 6 months ago but had Over Targets since then, the percentage  value is defaulted to 999%.