按尺寸计算，横幅广告的观看率为23.1%，紧随其后的是矩形广告(22.7%)和非标准单位的广告(22.1%)。

In terms of size, banners represented 23.1 percent of impressions, followed by rectangles (22.7 percent) and non-standard units (22.1 percent).

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最常见的具体广告尺寸为中等矩形（尺寸300x250），占18.6%，横幅广告（728x90），占18.3%，纽扣广告（120x90）占14.7%。

The most common specific ad sizes were medium rectangles (300 x 250 in dimension) at 18.6 percent, leaderboards (728 x 90) at 18.3 percent, and buttons (120 x 90) at 14.7 percent.

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