-60.39% is the change from 866 to 343
Calculation steps:
[( 343 - 866 ) ÷ 866] x 100 = -60.39%
Formula
Percentage change = [(343 - 866) / 866] x 100
Subtract the new number by the original number
343 - 866 = -523
-523 ÷ 866 = -0.6039260969976905
-0.6039260969976905 x 100 = -60.39%