Consider the actual and forecast values contained in the table.

Actual Forecast Actual Forecast

$2021\mathrm{.}83632\mathrm{.}5$

$2318\mathrm{.}63835\mathrm{.}2$

$2726\mathrm{.}33937\mathrm{.}9$

$29244235\mathrm{.}6$

$3228\mathrm{.}74542\mathrm{.}3$

What is the tracking signal for the $6$th point in the series $($actual $=36$ & forecast $=32\mathrm{.}5)?$