-64.67% is the change from 866 to 306
Calculation steps:
[( 306 - 866 ) ÷ 866] x 100 = -64.67%
Formula
Percentage change = [(306 - 866) / 866] x 100
Subtract the new number by the original number
306 - 866 = -560
-560 ÷ 866 = -0.6466512702078522
-0.6466512702078522 x 100 = -64.67%