-89.13% is the change from 644 to 70
Calculation steps:
[( 70 - 644 ) ÷ 644] x 100 = -89.13%
Formula
Percentage change = [(70 - 644) / 644] x 100
Subtract the new number by the original number
70 - 644 = -574
-574 ÷ 644 = -0.8913043478260869
-0.8913043478260869 x 100 = -89.13%