Price and yield

Field	Type	Nullable	Description
`clean_price`	decimal	never blank	SQX evaluated price without accrued interest. Unit: percent of par.
`dirty_price`	decimal	never blank	SQX evaluated price with accrued interest (clean_price plus accrued_interest). Unit: percent of par.
`accrued_interest`	decimal	never blank	Interest accrued since the last coupon date, per 100 of face value. Unit: percent of par.
`yield`	decimal	never blank	Yield of the evaluated price to yield_date, as yield_type states. Unit: percent.
`yield_type`	code	never blank	YTM (to maturity) or YTC (to a call date, when a call gives the lower yield).
`yield_date`	date	never blank	The date the yield is worked to: the maturity date, or the call date for YTC.
`current_yield`	decimal	blank unless the bond pays a coupon	Annual coupon divided by the clean price, in percent. Unit: percent.