-1.61% is the change from 930 to 915
Calculation steps:
[( 915 - 930 ) ÷ 930] x 100 = -1.61%
Formula
Percentage change = [(915 - 930) / 930] x 100
Subtract the new number by the original number
915 - 930 = -15
-15 ÷ 930 = -0.016129032258064516
-0.016129032258064516 x 100 = -1.61%