-17.85% is the change from 997 to 819
Calculation steps:
[( 819 - 997 ) ÷ 997] x 100 = -17.85%
Formula
Percentage change = [(819 - 997) / 997] x 100
Subtract the new number by the original number
819 - 997 = -178
-178 ÷ 997 = -0.17853560682046138
-0.17853560682046138 x 100 = -17.85%