-3.21% is the change from 936 to 906
Calculation steps:
[( 906 - 936 ) ÷ 936] x 100 = -3.21%
Formula
Percentage change = [(906 - 936) / 936] x 100
Subtract the new number by the original number
906 - 936 = -30
-30 ÷ 936 = -0.03205128205128205
-0.03205128205128205 x 100 = -3.21%