-91.61% is the change from 644 to 54
Calculation steps:
[( 54 - 644 ) ÷ 644] x 100 = -91.61%
Formula
Percentage change = [(54 - 644) / 644] x 100
Subtract the new number by the original number
54 - 644 = -590
-590 ÷ 644 = -0.9161490683229814
-0.9161490683229814 x 100 = -91.61%