-2.24% is the change from 313 to 306
Calculation steps:
[( 306 - 313 ) ÷ 313] x 100 = -2.24%
Formula
Percentage change = [(306 - 313) / 313] x 100
Subtract the new number by the original number
306 - 313 = -7
-7 ÷ 313 = -0.022364217252396165
-0.022364217252396165 x 100 = -2.24%