-4.4% is the change from 91 to 87
Calculation steps:
[( 87 - 91 ) ÷ 91] x 100 = -4.4%
Formula
Percentage change = [(87 - 91) / 91] x 100
Subtract the new number by the original number
87 - 91 = -4
-4 ÷ 91 = -0.04395604395604396
-0.04395604395604396 x 100 = -4.4%