-18.76% is the change from 821 to 667
Calculation steps:
[( 667 - 821 ) ÷ 821] x 100 = -18.76%
Formula
Percentage change = [(667 - 821) / 821] x 100
Subtract the new number by the original number
667 - 821 = -154
-154 ÷ 821 = -0.18757612667478685
-0.18757612667478685 x 100 = -18.76%