-1.93% is the change from 933 to 915
Calculation steps:
[( 915 - 933 ) ÷ 933] x 100 = -1.93%
Formula
Percentage change = [(915 - 933) / 933] x 100
Subtract the new number by the original number
915 - 933 = -18
-18 ÷ 933 = -0.01929260450160772
-0.01929260450160772 x 100 = -1.93%