Tokyo, Jan. 6 (Jiji Press)--Japan's Finance Ministry on Tuesday set the coupon rate for new 10-year Japanese government bonds at 2.1 pct, highest in 28 years. The coupon rate for the January issue jumped from 1.7 pct the previous month, as long-term interest rates are rising, reflecting the view that the Bank of Japan will continue to raise interest rates. Higher coupon rates boost debt-...