-32.92% is the change from 960 to 644
Calculation steps:
[( 644 - 960 ) ÷ 960] x 100 = -32.92%
Formula
Percentage change = [(644 - 960) / 960] x 100
Subtract the new number by the original number
644 - 960 = -316
-316 ÷ 960 = -0.32916666666666666
-0.32916666666666666 x 100 = -32.92%