-0.33% is the change from 915 to 912
Calculation steps:
[( 912 - 915 ) ÷ 915] x 100 = -0.33%
Formula
Percentage change = [(912 - 915) / 915] x 100
Subtract the new number by the original number
912 - 915 = -3
-3 ÷ 915 = -0.003278688524590164
-0.003278688524590164 x 100 = -0.33%