-94.44% is the change from 18 to 1
Calculation steps:
[( 1 - 18 ) ÷ 18] x 100 = -94.44%
Formula
Percentage change = [(1 - 18) / 18] x 100
Subtract the new number by the original number
1 - 18 = -17
-17 ÷ 18 = -0.9444444444444444
-0.9444444444444444 x 100 = -94.44%