-70.3% is the change from 909 to 270
Calculation steps:
[( 270 - 909 ) ÷ 909] x 100 = -70.3%
Formula
Percentage change = [(270 - 909) / 909] x 100
Subtract the new number by the original number
270 - 909 = -639
-639 ÷ 909 = -0.7029702970297029
-0.7029702970297029 x 100 = -70.3%