-89.11% is the change from 643 to 70
Calculation steps:
[( 70 - 643 ) ÷ 643] x 100 = -89.11%
Formula
Percentage change = [(70 - 643) / 643] x 100
Subtract the new number by the original number
70 - 643 = -573
-573 ÷ 643 = -0.8911353032659409
-0.8911353032659409 x 100 = -89.11%