-66.5% is the change from 400 to 134
Calculation steps:
[( 134 - 400 ) ÷ 400] x 100 = -66.5%
Formula
Percentage change = [(134 - 400) / 400] x 100
Subtract the new number by the original number
134 - 400 = -266
-266 ÷ 400 = -0.665
-0.665 x 100 = -66.5%