$ABF SG BOND ETF (A35.SG)$ Early Sep, price was around 1.180...

$ABF SG BOND ETF(A35.SG)$ Early Sep, price was around 1.180. Today, it hits 1.154, drop of around 2% over span of 1 mth+. Wonder why? Is mkt expecting SGD interest rate to rise soon? Anyway, historical low was 1.100 on Oct 2018, 3 yrs ago.