-18.24% is the change from 307 to 251
Calculation steps:
[( 251 - 307 ) ÷ 307] x 100 = -18.24%
Formula
Percentage change = [(251 - 307) / 307] x 100
Subtract the new number by the original number
251 - 307 = -56
-56 ÷ 307 = -0.18241042345276873
-0.18241042345276873 x 100 = -18.24%