Macotakara, the pretty reliable Japanese blog, relayed a MM Research Institute study today which pegged Apple's iPhone sales in Japan for the fiscal year 2011 at 7.25 million units. According to Apple's Q1 2012 earnings, the company shipped 35.1 million iPhones worldwide.
Unfortunately, Apple doesn't divulge iPhone unit sales on a per-country basis and only breaks down sales by region such as Asia-Pacific, North America, Europe and so forth...