-67.11% is the change from 821 to 270
Calculation steps:
[( 270 - 821 ) ÷ 821] x 100 = -67.11%
Formula
Percentage change = [(270 - 821) / 821] x 100
Subtract the new number by the original number
270 - 821 = -551
-551 ÷ 821 = -0.6711327649208283
-0.6711327649208283 x 100 = -67.11%