-60.16% is the change from 866 to 345
Calculation steps:
[( 345 - 866 ) ÷ 866] x 100 = -60.16%
Formula
Percentage change = [(345 - 866) / 866] x 100
Subtract the new number by the original number
345 - 866 = -521
-521 ÷ 866 = -0.6016166281755196
-0.6016166281755196 x 100 = -60.16%