-49.57% is the change from 821 to 414
Calculation steps:
[( 414 - 821 ) ÷ 821] x 100 = -49.57%
Formula
Percentage change = [(414 - 821) / 821] x 100
Subtract the new number by the original number
414 - 821 = -407
-407 ÷ 821 = -0.49573690621193667
-0.49573690621193667 x 100 = -49.57%