-1.63% is the change from 921 to 906
Calculation steps:
[( 906 - 921 ) ÷ 921] x 100 = -1.63%
Formula
Percentage change = [(906 - 921) / 921] x 100
Subtract the new number by the original number
906 - 921 = -15
-15 ÷ 921 = -0.016286644951140065
-0.016286644951140065 x 100 = -1.63%