-6.13% is the change from 815 to 765
Calculation steps:
[( 765 - 815 ) ÷ 815] x 100 = -6.13%
Formula
Percentage change = [(765 - 815) / 815] x 100
Subtract the new number by the original number
765 - 815 = -50
-50 ÷ 815 = -0.06134969325153374
-0.06134969325153374 x 100 = -6.13%