-18.05% is the change from 997 to 817
Calculation steps:
[( 817 - 997 ) ÷ 997] x 100 = -18.05%
Formula
Percentage change = [(817 - 997) / 997] x 100
Subtract the new number by the original number
817 - 997 = -180
-180 ÷ 997 = -0.18054162487462388
-0.18054162487462388 x 100 = -18.05%