the coefficient of variation for the US long term government ?

Table 24 Arithmetic Mean Annual Return and Standard Deviation of Returns, U.S. Asset Classes, 1926-2002 Asset Class Arithmetic Mean Return (%) Standard Deviation of Return (%) 12.3 21.9 35.1 16.9 S&P 500 U.S. small stock U.S. long-term corporate U.S. long-term government U.S. 30-day T-bill 6.1 7.2 8.2 5.8 3.8 0.9