(2nd LD) N. Korea's economy grew 3.9 pct in 2016: BOK
(ATTN: UPDATES with analyst's comment)
SEOUL, July 21 (Yonhap) -- North Korea's economy grew 3.9 percent last year, the fastest pace in more than a decade, South Korea's central bank said Friday, despite tough U.N. sanctions over Pyongyang's nuclear a