-63.25% is the change from 166 to 61
Calculation steps:
[( 61 - 166 ) ÷ 166] x 100 = -63.25%
Formula
Percentage change = [(61 - 166) / 166] x 100
Subtract the new number by the original number
61 - 166 = -105
-105 ÷ 166 = -0.6325301204819277
-0.6325301204819277 x 100 = -63.25%