-58.38% is the change from 817 to 340
Calculation steps:
[( 340 - 817 ) ÷ 817] x 100 = -58.38%
Formula
Percentage change = [(340 - 817) / 817] x 100
Subtract the new number by the original number
340 - 817 = -477
-477 ÷ 817 = -0.583843329253366
-0.583843329253366 x 100 = -58.38%