-32.95% is the change from 777 to 521
Calculation steps:
[( 521 - 777 ) ÷ 777] x 100 = -32.95%
Formula
Percentage change = [(521 - 777) / 777] x 100
Subtract the new number by the original number
521 - 777 = -256
-256 ÷ 777 = -0.32947232947232946
-0.32947232947232946 x 100 = -32.95%