-69.47% is the change from 917 to 280
Calculation steps:
[( 280 - 917 ) ÷ 917] x 100 = -69.47%
Formula
Percentage change = [(280 - 917) / 917] x 100
Subtract the new number by the original number
280 - 917 = -637
-637 ÷ 917 = -0.6946564885496184
-0.6946564885496184 x 100 = -69.47%