-6.99% is the change from 815 to 758
Calculation steps:
[( 758 - 815 ) ÷ 815] x 100 = -6.99%
Formula
Percentage change = [(758 - 815) / 815] x 100
Subtract the new number by the original number
758 - 815 = -57
-57 ÷ 815 = -0.06993865030674846
-0.06993865030674846 x 100 = -6.99%