-89.3% is the change from 645 to 69
Calculation steps:
[( 69 - 645 ) ÷ 645] x 100 = -89.3%
Formula
Percentage change = [(69 - 645) / 645] x 100
Subtract the new number by the original number
69 - 645 = -576
-576 ÷ 645 = -0.8930232558139535
-0.8930232558139535 x 100 = -89.3%