-16.85% is the change from 991 to 824
Calculation steps:
[( 824 - 991 ) ÷ 991] x 100 = -16.85%
Formula
Percentage change = [(824 - 991) / 991] x 100
Subtract the new number by the original number
824 - 991 = -167
-167 ÷ 991 = -0.16851664984863773
-0.16851664984863773 x 100 = -16.85%