-57.65% is the change from 810 to 343
Calculation steps:
[( 343 - 810 ) ÷ 810] x 100 = -57.65%
Formula
Percentage change = [(343 - 810) / 810] x 100
Subtract the new number by the original number
343 - 810 = -467
-467 ÷ 810 = -0.5765432098765432
-0.5765432098765432 x 100 = -57.65%