-1.72% is the change from 987 to 970
Calculation steps:
[( 970 - 987 ) ÷ 987] x 100 = -1.72%
Formula
Percentage change = [(970 - 987) / 987] x 100
Subtract the new number by the original number
970 - 987 = -17
-17 ÷ 987 = -0.017223910840932118
-0.017223910840932118 x 100 = -1.72%