-77.5% is the change from 991 to 223
Calculation steps:
[( 223 - 991 ) ÷ 991] x 100 = -77.5%
Formula
Percentage change = [(223 - 991) / 991] x 100
Subtract the new number by the original number
223 - 991 = -768
-768 ÷ 991 = -0.7749747729566094
-0.7749747729566094 x 100 = -77.5%