-58.22% is the change from 821 to 343
Calculation steps:
[( 343 - 821 ) ÷ 821] x 100 = -58.22%
Formula
Percentage change = [(343 - 821) / 821] x 100
Subtract the new number by the original number
343 - 821 = -478
-478 ÷ 821 = -0.582216808769793
-0.582216808769793 x 100 = -58.22%