Historical returns. Calculate the arithmetic average return of U$.$S$.$ Treasury bills, long$-$term government bonds, and large$-$company stocks for $1985$ to $1994.$ Which had the highest return? Which

had the lowest return? Click on "Get more help" menu, then select "Spreadsheet" to see Table $8\mathrm{.}1-$Year$-$by$-$Year Returns, $1950-1999.$

What is the average return of U$.$S$.$ Treasury bills for $1985$ to $1994?$

$\%($Round to two decimal places.$)$