The Bloomberg Dollar Spot Index, which tracks the US currency against 10 major counterparts, rose 0.8 percent this week to 1,032.39 and touched 1,032.84 on Friday, the highest since Sept. 9 last year.
The greenback rose 0.9 percent to US$1.3541 per euro this week, while gaining 0.1 percent to ￥104.32, as the euro fell 0.8 percent to ￥141.25.
The pound strengthened against the euro this week as a government report showed UK retail sales grew at a record pace last month.
The British currency rose 0.5 percent this week to ￡0.8248 per euro on Friday, after appreciating to ￡0.8231 on Jan. 9 — the strongest level since last January — while weakening 0.3 percent against the greenback to US$1.6433.
The pound has appreciated at least 2 percent against its major counterparts in the past six months.