Summary U.S. dollar up 8.6% so far in 2022Euro set for 6.2% annual lossLONDON/SINGAPORE, Dec 30 (Reuters) - The dollar was on track for its biggest annual gain since 2015 on Friday, in the last trading day of a year dominated by Federal Reserve rate hikes and fears of a sharp slowdown in global growth. In thin trading, the dollar index was down around 0.1% on the day at 103.900 . The euro was flat on the day at $1.066 , on track for a 6.2% annual loss versus the dollar, compared to last year's 7% drop. The Bank of Japan's ultra-dovish stance has seen the dollar gain 14.5% versus the yen so far this year, in the yen's worst performance since 2013. The onshore yuan was set for its worst annual performance in 28 years, hurt by dollar strength and a domestic economic slowdown.

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