-0.33% is the change from 306 to 305
Calculation steps:
[( 305 - 306 ) ÷ 306] x 100 = -0.33%
Formula
Percentage change = [(305 - 306) / 306] x 100
Subtract the new number by the original number
305 - 306 = -1
-1 ÷ 306 = -0.0032679738562091504
-0.0032679738562091504 x 100 = -0.33%