-74.24% is the change from 66 to 17
Calculation steps:
[( 17 - 66 ) ÷ 66] x 100 = -74.24%
Formula
Percentage change = [(17 - 66) / 66] x 100
Subtract the new number by the original number
17 - 66 = -49
-49 ÷ 66 = -0.7424242424242424
-0.7424242424242424 x 100 = -74.24%