-93.02% is the change from 215 to 15
Calculation steps:
[( 15 - 215 ) ÷ 215] x 100 = -93.02%
Formula
Percentage change = [(15 - 215) / 215] x 100
Subtract the new number by the original number
15 - 215 = -200
-200 ÷ 215 = -0.9302325581395349
-0.9302325581395349 x 100 = -93.02%