-68.11% is the change from 806 to 257
Calculation steps:
[( 257 - 806 ) ÷ 806] x 100 = -68.11%
Formula
Percentage change = [(257 - 806) / 806] x 100
Subtract the new number by the original number
257 - 806 = -549
-549 ÷ 806 = -0.6811414392059554
-0.6811414392059554 x 100 = -68.11%