-59.61% is the change from 510 to 206
Calculation steps:
[( 206 - 510 ) ÷ 510] x 100 = -59.61%
Formula
Percentage change = [(206 - 510) / 510] x 100
Subtract the new number by the original number
206 - 510 = -304
-304 ÷ 510 = -0.596078431372549
-0.596078431372549 x 100 = -59.61%