-91.9% is the change from 839 to 68
Calculation steps:
[( 68 - 839 ) ÷ 839] x 100 = -91.9%
Formula
Percentage change = [(68 - 839) / 839] x 100
Subtract the new number by the original number
68 - 839 = -771
-771 ÷ 839 = -0.9189511323003575
-0.9189511323003575 x 100 = -91.9%