-70.4% is the change from 821 to 243
Calculation steps:
[( 243 - 821 ) ÷ 821] x 100 = -70.4%
Formula
Percentage change = [(243 - 821) / 821] x 100
Subtract the new number by the original number
243 - 821 = -578
-578 ÷ 821 = -0.7040194884287454
-0.7040194884287454 x 100 = -70.4%