-17.72% is the change from 993 to 817
Calculation steps:
[( 817 - 993 ) ÷ 993] x 100 = -17.72%
Formula
Percentage change = [(817 - 993) / 993] x 100
Subtract the new number by the original number
817 - 993 = -176
-176 ÷ 993 = -0.1772406847935549
-0.1772406847935549 x 100 = -17.72%