-84.19% is the change from 215 to 34
Calculation steps:
[( 34 - 215 ) ÷ 215] x 100 = -84.19%
Formula
Percentage change = [(34 - 215) / 215] x 100
Subtract the new number by the original number
34 - 215 = -181
-181 ÷ 215 = -0.8418604651162791
-0.8418604651162791 x 100 = -84.19%