-83.63% is the change from 611 to 100
Calculation steps:
[( 100 - 611 ) ÷ 611] x 100 = -83.63%
Formula
Percentage change = [(100 - 611) / 611] x 100
Subtract the new number by the original number
100 - 611 = -511
-511 ÷ 611 = -0.8363338788870703
-0.8363338788870703 x 100 = -83.63%