-66.12% is the change from 490 to 166
Calculation steps:
[( 166 - 490 ) ÷ 490] x 100 = -66.12%
Formula
Percentage change = [(166 - 490) / 490] x 100
Subtract the new number by the original number
166 - 490 = -324
-324 ÷ 490 = -0.6612244897959184
-0.6612244897959184 x 100 = -66.12%