AdMob reports that traffic from the network’s publishers has grown by more than 104% over the last year. The amount of ads it served in June represented an almost 20% increase over May.

With an 18.7% increase in June to 228 million, U.S. ad requests continued to soar, the company said. Indonesian traffic more than doubled to 472 million requests, securing its status as AdMob’s second largest market. That was driven primarily by new publishers in the AdMob network with significant Indonesian inventory.

Apple’s iPhone and iPod Touch showed strong growth, with ad impressions increasing by 32% worldwide to 52 million in June. The devices also maintained their No. 9 position in the top 10 global handset ranking.

Other statistics released by the company include:

• 24.3% of ad requests in the AdMob network worldwide were from smartphones, increasing from 22.4% in May.
• Motorola lost share in each of the top 5 markets in June, leading to a 2.2% decline in share worldwide.
• Palm continued growing and now represents 2% of requests worldwide.