-71.13% is the change from 821 to 237
Calculation steps:
[( 237 - 821 ) ÷ 821] x 100 = -71.13%
Formula
Percentage change = [(237 - 821) / 821] x 100
Subtract the new number by the original number
237 - 821 = -584
-584 ÷ 821 = -0.7113276492082826
-0.7113276492082826 x 100 = -71.13%