-7.58% is the change from 66 to 61
Calculation steps:
[( 61 - 66 ) ÷ 66] x 100 = -7.58%
Formula
Percentage change = [(61 - 66) / 66] x 100
Subtract the new number by the original number
61 - 66 = -5
-5 ÷ 66 = -0.07575757575757576
-0.07575757575757576 x 100 = -7.58%