-43.79% is the change from 991 to 557
Calculation steps:
[( 557 - 991 ) ÷ 991] x 100 = -43.79%
Formula
Percentage change = [(557 - 991) / 991] x 100
Subtract the new number by the original number
557 - 991 = -434
-434 ÷ 991 = -0.437941473259334
-0.437941473259334 x 100 = -43.79%