-52.48% is the change from 644 to 306
Calculation steps:
[( 306 - 644 ) ÷ 644] x 100 = -52.48%
Formula
Percentage change = [(306 - 644) / 644] x 100
Subtract the new number by the original number
306 - 644 = -338
-338 ÷ 644 = -0.5248447204968945
-0.5248447204968945 x 100 = -52.48%