-61.4% is the change from 215 to 83
Calculation steps:
[( 83 - 215 ) ÷ 215] x 100 = -61.4%
Formula
Percentage change = [(83 - 215) / 215] x 100
Subtract the new number by the original number
83 - 215 = -132
-132 ÷ 215 = -0.6139534883720931
-0.6139534883720931 x 100 = -61.4%