-66.88% is the change from 921 to 305
Calculation steps:
[( 305 - 921 ) ÷ 921] x 100 = -66.88%
Formula
Percentage change = [(305 - 921) / 921] x 100
Subtract the new number by the original number
305 - 921 = -616
-616 ÷ 921 = -0.6688382193268186
-0.6688382193268186 x 100 = -66.88%