-16.72% is the change from 921 to 767
Calculation steps:
[( 767 - 921 ) ÷ 921] x 100 = -16.72%
Formula
Percentage change = [(767 - 921) / 921] x 100
Subtract the new number by the original number
767 - 921 = -154
-154 ÷ 921 = -0.16720955483170466
-0.16720955483170466 x 100 = -16.72%