-72.8% is the change from 945 to 257
Calculation steps:
[( 257 - 945 ) ÷ 945] x 100 = -72.8%
Formula
Percentage change = [(257 - 945) / 945] x 100
Subtract the new number by the original number
257 - 945 = -688
-688 ÷ 945 = -0.728042328042328
-0.728042328042328 x 100 = -72.8%