-18.92% is the change from 37 to 30
Calculation steps:
[( 30 - 37 ) ÷ 37] x 100 = -18.92%
Formula
Percentage change = [(30 - 37) / 37] x 100
Subtract the new number by the original number
30 - 37 = -7
-7 ÷ 37 = -0.1891891891891892
-0.1891891891891892 x 100 = -18.92%