-67.65% is the change from 510 to 165
Calculation steps:
[( 165 - 510 ) ÷ 510] x 100 = -67.65%
Formula
Percentage change = [(165 - 510) / 510] x 100
Subtract the new number by the original number
165 - 510 = -345
-345 ÷ 510 = -0.6764705882352942
-0.6764705882352942 x 100 = -67.65%