-1.5% is the change from 133 to 131
Calculation steps:
[( 131 - 133 ) ÷ 133] x 100 = -1.5%
Formula
Percentage change = [(131 - 133) / 133] x 100
Subtract the new number by the original number
131 - 133 = -2
-2 ÷ 133 = -0.015037593984962405
-0.015037593984962405 x 100 = -1.5%