-29.04% is the change from 909 to 645
Calculation steps:
[( 645 - 909 ) ÷ 909] x 100 = -29.04%
Formula
Percentage change = [(645 - 909) / 909] x 100
Subtract the new number by the original number
645 - 909 = -264
-264 ÷ 909 = -0.29042904290429045
-0.29042904290429045 x 100 = -29.04%