-86.42% is the change from 611 to 83
Calculation steps:
[( 83 - 611 ) ÷ 611] x 100 = -86.42%
Formula
Percentage change = [(83 - 611) / 611] x 100
Subtract the new number by the original number
83 - 611 = -528
-528 ÷ 611 = -0.8641571194762684
-0.8641571194762684 x 100 = -86.42%