-2.3% is the change from 87 to 85
Calculation steps:
[( 85 - 87 ) ÷ 87] x 100 = -2.3%
Formula
Percentage change = [(85 - 87) / 87] x 100
Subtract the new number by the original number
85 - 87 = -2
-2 ÷ 87 = -0.022988505747126436
-0.022988505747126436 x 100 = -2.3%