Compute the annual tracking error from the following information $($Chapter $25)$:

$\backslash$table$[[$Month$,\backslash$table$[[$Portfolio A$\text{'}$s$],[$return $(\%)]],\backslash$table$[[$Portfolio B $($Benchmark$)\text{'}$s$],[$return $(\%)]]],[$Jan$,2\mathrm{.}15,1\mathrm{.}65],[$Feb$,0\mathrm{.}89,-0\mathrm{.}10],[$Mar$,1\mathrm{.}15,0\mathrm{.}52],[$Apr$,-0\mathrm{.}47,-0\mathrm{.}60],[$May$,1\mathrm{.}71,0\mathrm{.}65],[$June$,0\mathrm{.}10,0\mathrm{.}33]]$

$\backslash$table$[[$July$,1\mathrm{.}04,2\mathrm{.}31],[$Aug$,2\mathrm{.}70,1\mathrm{.}10],[$Sep$,0\mathrm{.}66,1\mathrm{.}23],[$Oct$,2\mathrm{.}15,2\mathrm{.}02],[$Nov$,-1\mathrm{.}38,-0\mathrm{.}61],[$Dec$,-0\mathrm{.}59,-1\mathrm{.}20]]$

In addition, discuss what is meant by a tracking error of a portfolio.