-66.45% is the change from 766 to 257
Calculation steps:
[( 257 - 766 ) ÷ 766] x 100 = -66.45%
Formula
Percentage change = [(257 - 766) / 766] x 100
Subtract the new number by the original number
257 - 766 = -509
-509 ÷ 766 = -0.664490861618799
-0.664490861618799 x 100 = -66.45%