-18.92% is the change from 777 to 630
Calculation steps:
[( 630 - 777 ) ÷ 777] x 100 = -18.92%
Formula
Percentage change = [(630 - 777) / 777] x 100
Subtract the new number by the original number
630 - 777 = -147
-147 ÷ 777 = -0.1891891891891892
-0.1891891891891892 x 100 = -18.92%