The table below gives $P=f(t),$ the number of households, in millions, in the US with cable television $t$ years since $1998.{?}^1$

$\backslash$table$[[t,0,2,4,6,8,10,12],[P,64\mathrm{.}650,66\mathrm{.}250,66\mathrm{.}472,65\mathrm{.}727,65\mathrm{.}319,64\mathrm{.}274,60\mathrm{.}958]]($b$)$ Estimate $f^{\text{'}}(2).$ Estimate $f^{\text{'}}(8).$

Round your answers to three decimal places.

$f^{\text{'}}(2)$~~

$f^{\text{'}}(8)$~~

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The interpretation of $f^{\text{'}}(8)$ is $$