While five-year bonds were sold with an annual interest rate of between 4.6%, those for seven-, 10- and 15-year bonds are 4.8%, 5.38% and 5.75% respectively.Meanwhile the 30-year bonds bear the respective interest rate of 6.1%.Compared to the previous month, the August interest rates dropped 0.12 percent for five-year and 30-year bonds and 0.15 percent for seven-year bonds while those for 10-year and 15-year bonds remained unchanged.In the secondary market, the total trading volume of Government bonds sold outright reached over 902.5 million bonds worth more than VND99.5 trillion, a monthly decline of 10.3%.The volume of G-bonds sold through repurchase (repo) agreements was estimated at over 1,186 million bonds valued at over VND119 trillion, a month-on-month increase of 20.4%.Foreign investors made outright transactions worth over VND4.9 trillion in purchase value and over VND5.5 trillion in sale value.They also had repo selling of over VND98.9 trillion and no purchasing repo transaction this month.