Table 9.2 average returns for bonds

T-bills

1950 to 1959 average 2.3%

1960 to 1969 average 4.1%

1970 to 1979 average 6.0%

1980 to 1989 average 8.4%

1990 to 1999 average 4.8%

2000 to 2009 average 2.6%

table 9.4 annual standard deviation for t-bills

T-bills

1950 to 1959 1.2%

1960 to 1969 1.9%

1970 to 1979 2.1%

1980 to 1989 2.5%

1990 to 1999 1.4%

2000 to 2009 2.2%

Use the tables above to calculate the coefficient of variation of the risk-return relationship in T-bills during each decade since 1950. (Round your answers to 2 decimal places.)