-70.03% is the change from 644 to 193
Calculation steps:
[( 193 - 644 ) ÷ 644] x 100 = -70.03%
Formula
Percentage change = [(193 - 644) / 644] x 100
Subtract the new number by the original number
193 - 644 = -451
-451 ÷ 644 = -0.7003105590062112
-0.7003105590062112 x 100 = -70.03%