-62.05% is the change from 166 to 63
Calculation steps:
[( 63 - 166 ) ÷ 166] x 100 = -62.05%
Formula
Percentage change = [(63 - 166) / 166] x 100
Subtract the new number by the original number
63 - 166 = -103
-103 ÷ 166 = -0.6204819277108434
-0.6204819277108434 x 100 = -62.05%