the following is about 2005,
actually you can find that UK used more EB1 visa numbers in 2006 also.
Link:
http://www.eatonpeabody.com/news/news-11-18-05-immupdate.htm
http://www.eatonpeabody.com/news/news-11-18-05-immupdate.htm
interesting info:
The AC21 removed the per-country limit in any calendar quarter in which overall applicant demand for Employment-based visa numbers is less than the total of such numbers available.
In recent years, the application of the rules outlined in AC21 has allowed countries such as China – mainland born, India, and the Philippines to utilize large amounts of employment numbers which would have otherwise gone unused.