Children with buckets sit on a sidewalk in Skofla Loka, Slovenia in September. (Srdjan Zivulovic/Reuters/File)
Slovenia – 3.4 percent
Only 670 Slovenian babies born in 2007 were conceived with IVF technology, but since fewer than 20,000 babies were born in this tiny eastern European country that year, it puts Slovenia fourth on our list. That's just behind....