-1.31% is the change from 306 to 302
Calculation steps:
[( 302 - 306 ) ÷ 306] x 100 = -1.31%
Formula
Percentage change = [(302 - 306) / 306] x 100
Subtract the new number by the original number
302 - 306 = -4
-4 ÷ 306 = -0.013071895424836602
-0.013071895424836602 x 100 = -1.31%