-39.4% is the change from 566 to 343
Calculation steps:
[( 343 - 566 ) ÷ 566] x 100 = -39.4%
Formula
Percentage change = [(343 - 566) / 566] x 100
Subtract the new number by the original number
343 - 566 = -223
-223 ÷ 566 = -0.39399293286219084
-0.39399293286219084 x 100 = -39.4%