-66.92% is the change from 777 to 257
Calculation steps:
[( 257 - 777 ) ÷ 777] x 100 = -66.92%
Formula
Percentage change = [(257 - 777) / 777] x 100
Subtract the new number by the original number
257 - 777 = -520
-520 ÷ 777 = -0.6692406692406693
-0.6692406692406693 x 100 = -66.92%