-67.4% is the change from 770 to 251
Calculation steps:
[( 251 - 770 ) ÷ 770] x 100 = -67.4%
Formula
Percentage change = [(251 - 770) / 770] x 100
Subtract the new number by the original number
251 - 770 = -519
-519 ÷ 770 = -0.674025974025974
-0.674025974025974 x 100 = -67.4%