-64.45% is the change from 931 to 331
Calculation steps:
[( 331 - 931 ) ÷ 931] x 100 = -64.45%
Formula
Percentage change = [(331 - 931) / 931] x 100
Subtract the new number by the original number
331 - 931 = -600
-600 ÷ 931 = -0.644468313641246
-0.644468313641246 x 100 = -64.45%