-5.77% is the change from 815 to 768
Calculation steps:
[( 768 - 815 ) ÷ 815] x 100 = -5.77%
Formula
Percentage change = [(768 - 815) / 815] x 100
Subtract the new number by the original number
768 - 815 = -47
-47 ÷ 815 = -0.05766871165644172
-0.05766871165644172 x 100 = -5.77%