-82.34% is the change from 821 to 145
Calculation steps:
[( 145 - 821 ) ÷ 821] x 100 = -82.34%
Formula
Percentage change = [(145 - 821) / 821] x 100
Subtract the new number by the original number
145 - 821 = -676
-676 ÷ 821 = -0.8233861144945189
-0.8233861144945189 x 100 = -82.34%