If you calculate the magnitude the deceleration from the values in the table, (using SUVAT) it'll show you a constant value of deceleration at -6.25 (negative as it's decelerating), assuming those values are all for the same vehicle.
S=? U=30 V=0 A= -6.25 T=X s=0^2-30^2/2*(-6.25) = 72
72+18 = 90m