-98.45% is the change from 644 to 10
Calculation steps:
[( 10 - 644 ) ÷ 644] x 100 = -98.45%
Formula
Percentage change = [(10 - 644) / 644] x 100
Subtract the new number by the original number
10 - 644 = -634
-634 ÷ 644 = -0.984472049689441
-0.984472049689441 x 100 = -98.45%