-15.36% is the change from 306 to 259
Calculation steps:
[( 259 - 306 ) ÷ 306] x 100 = -15.36%
Formula
Percentage change = [(259 - 306) / 306] x 100
Subtract the new number by the original number
259 - 306 = -47
-47 ÷ 306 = -0.15359477124183007
-0.15359477124183007 x 100 = -15.36%