-71.9% is the change from 765 to 215
Calculation steps:
[( 215 - 765 ) ÷ 765] x 100 = -71.9%
Formula
Percentage change = [(215 - 765) / 765] x 100
Subtract the new number by the original number
215 - 765 = -550
-550 ÷ 765 = -0.7189542483660131
-0.7189542483660131 x 100 = -71.9%