Table $9\mathrm{.}2$ Average Returns for Bonds

Long$-$Term Treasury Bonds

$1950$ to $1959$ Average $0\mathrm{.}0\%$

$1960$ to $1969$ Average $1\mathrm{.}9$

$1970$ to $1979$ Average $5\mathrm{.}2$

$1980$ to $1989$ Average $13\mathrm{.}5$

$1990$ to $1999$ Average $9\mathrm{.}6$

$2000$ to $2009$ Average $8\mathrm{.}9$

Table $9\mathrm{.}4$ Annual Standard Deviation for Bonds

Long$-$Term Treasury Bonds

$1950$ to $19594\mathrm{.}1\%$

$1960$ to $19696\mathrm{.}2$

$1970$ to $19796\mathrm{.}8$

$1980$ to $198915\mathrm{.}2$

$1990$ to $199912\mathrm{.}2$

$2000$ to $200910\mathrm{.}9$

Use the tables above to calculate the coefficient of variation of the risk$-$return relationship of the bond market during each decade since $1950.$