-63.9% is the change from 917 to 331
Calculation steps:
[( 331 - 917 ) ÷ 917] x 100 = -63.9%
Formula
Percentage change = [(331 - 917) / 917] x 100
Subtract the new number by the original number
331 - 917 = -586
-586 ÷ 917 = -0.6390403489640131
-0.6390403489640131 x 100 = -63.9%