-35.64% is the change from 390 to 251
Calculation steps:
[( 251 - 390 ) ÷ 390] x 100 = -35.64%
Formula
Percentage change = [(251 - 390) / 390] x 100
Subtract the new number by the original number
251 - 390 = -139
-139 ÷ 390 = -0.3564102564102564
-0.3564102564102564 x 100 = -35.64%