-48.34% is the change from 991 to 512
Calculation steps:
[( 512 - 991 ) ÷ 991] x 100 = -48.34%
Formula
Percentage change = [(512 - 991) / 991] x 100
Subtract the new number by the original number
512 - 991 = -479
-479 ÷ 991 = -0.48335015136226034
-0.48335015136226034 x 100 = -48.34%