-89.42% is the change from 643 to 68
Calculation steps:
[( 68 - 643 ) ÷ 643] x 100 = -89.42%
Formula
Percentage change = [(68 - 643) / 643] x 100
Subtract the new number by the original number
68 - 643 = -575
-575 ÷ 643 = -0.8942457231726283
-0.8942457231726283 x 100 = -89.42%