-86.44% is the change from 612 to 83
Calculation steps:
[( 83 - 612 ) ÷ 612] x 100 = -86.44%
Formula
Percentage change = [(83 - 612) / 612] x 100
Subtract the new number by the original number
83 - 612 = -529
-529 ÷ 612 = -0.8643790849673203
-0.8643790849673203 x 100 = -86.44%