-89.3% is the change from 215 to 23
Calculation steps:
[( 23 - 215 ) ÷ 215] x 100 = -89.3%
Formula
Percentage change = [(23 - 215) / 215] x 100
Subtract the new number by the original number
23 - 215 = -192
-192 ÷ 215 = -0.8930232558139535
-0.8930232558139535 x 100 = -89.3%