Table 9.2 Average Returns for Bonds 1950 to 1959 Average 1960 to 1969 Average 1970 to 1979 Average 1980 to 1989 Average 1990 to 1999 Average 2000 to 2009 Average T-Bills 2.6% 4.7 6.1 8.3 5.4 2.3 Table 9.4 Annual Standard Deviation for T-Bills 1950 to 1959 1960 to 1969 1970 to 1979 1980 to 1989 1990 to 1999 2000 to 2009 T-Bills 1.0% 1.3 2.1 3.0 1.5 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.) CoV Decade 1950s 1960s 1970s 1980s 1990s 2000s