Month-over-month swings in energy demand

Energy traders watch sudden monthly jumps and drops in regional demand. The file energy.csv holds 24 months (2024-01 to 2025-12) for six regions.

• month: YYYY-MM
• region: region name
• mwh: consumption that month in MWh

For one region the rows appear in chronological order. Task: the first input line is a region, the second a threshold T (a number). For every month that has a previous month compute the percent change (mwh - previous) / previous x 100. Print one line MONTH CHANGE for each month whose absolute change is at least T, in chronological order, with CHANGE as a signed 2-decimal percent such as +12.34% or -8.10%. Finally print Biggest rise: MONTH CHANGE (the highest change, earliest month if tied). If the region has no rows print only No data.