-87.97% is the change from 690 to 83
Calculation steps:
[( 83 - 690 ) ÷ 690] x 100 = -87.97%
Formula
Percentage change = [(83 - 690) / 690] x 100
Subtract the new number by the original number
83 - 690 = -607
-607 ÷ 690 = -0.8797101449275362
-0.8797101449275362 x 100 = -87.97%