-45.17% is the change from 921 to 505
Calculation steps:
[( 505 - 921 ) ÷ 921] x 100 = -45.17%
Formula
Percentage change = [(505 - 921) / 921] x 100
Subtract the new number by the original number
505 - 921 = -416
-416 ÷ 921 = -0.4516829533116178
-0.4516829533116178 x 100 = -45.17%