-16.15% is the change from 644 to 540
Calculation steps:
[( 540 - 644 ) ÷ 644] x 100 = -16.15%
Formula
Percentage change = [(540 - 644) / 644] x 100
Subtract the new number by the original number
540 - 644 = -104
-104 ÷ 644 = -0.16149068322981366
-0.16149068322981366 x 100 = -16.15%