-31.08% is the change from 756 to 521
Calculation steps:
[( 521 - 756 ) ÷ 756] x 100 = -31.08%
Formula
Percentage change = [(521 - 756) / 756] x 100
Subtract the new number by the original number
521 - 756 = -235
-235 ÷ 756 = -0.31084656084656087
-0.31084656084656087 x 100 = -31.08%