-42.87% is the change from 912 to 521
Calculation steps:
[( 521 - 912 ) ÷ 912] x 100 = -42.87%
Formula
Percentage change = [(521 - 912) / 912] x 100
Subtract the new number by the original number
521 - 912 = -391
-391 ÷ 912 = -0.42872807017543857
-0.42872807017543857 x 100 = -42.87%