Problem $10-6$ Risk Premium $($LG$10-2)$

The average annual return on the S&P $500$ Index from $1996$ to $2005$ was $13\mathrm{.}04$ percent. The average annual T$-$bill yield during the same period was $3\mathrm{.}64$ percent.

What was the market risk premium during these ten years? $($Round your answer to $2$ decimal places.$)$