-66.34% is the change from 511 to 172
Calculation steps:
[( 172 - 511 ) ÷ 511] x 100 = -66.34%
Formula
Percentage change = [(172 - 511) / 511] x 100
Subtract the new number by the original number
172 - 511 = -339
-339 ÷ 511 = -0.6634050880626223
-0.6634050880626223 x 100 = -66.34%