-63.7% is the change from 909 to 330
Calculation steps:
[( 330 - 909 ) ÷ 909] x 100 = -63.7%
Formula
Percentage change = [(330 - 909) / 909] x 100
Subtract the new number by the original number
330 - 909 = -579
-579 ÷ 909 = -0.636963696369637
-0.636963696369637 x 100 = -63.7%