-41.78% is the change from 991 to 577
Calculation steps:
[( 577 - 991 ) ÷ 991] x 100 = -41.78%
Formula
Percentage change = [(577 - 991) / 991] x 100
Subtract the new number by the original number
577 - 991 = -414
-414 ÷ 991 = -0.4177598385469223
-0.4177598385469223 x 100 = -41.78%