-66.73% is the change from 511 to 170
Calculation steps:
[( 170 - 511 ) ÷ 511] x 100 = -66.73%
Formula
Percentage change = [(170 - 511) / 511] x 100
Subtract the new number by the original number
170 - 511 = -341
-341 ÷ 511 = -0.6673189823874756
-0.6673189823874756 x 100 = -66.73%