-91.3% is the change from 644 to 56
Calculation steps:
[( 56 - 644 ) ÷ 644] x 100 = -91.3%
Formula
Percentage change = [(56 - 644) / 644] x 100
Subtract the new number by the original number
56 - 644 = -588
-588 ÷ 644 = -0.9130434782608695
-0.9130434782608695 x 100 = -91.3%