The State Department’s Office of Children’s Issues has published and posted its 2010 Report on Compliance with the Hague Convention on the Civil Aspects of International Child Abduction  for the period from October 1, 2008 to septemnber 30, 2009.  According to the Report:

During FY 2009, the USCA received 1,135 new requests for assistance in the return of 1,621 children to the United States from other countries. Of these requests, 828 were alleged abductions to Convention partner countries. Of the ten countries with the highest incidence of reported abductions, only three (Japan, India, and the Philippines) are not Convention partners. These ten countries accounted for 623 cases or 55 percent: Mexico (309), Canada (74), Germany (50), the United Kingdom (48), India (34), Brazil (24), Japan (23), Colombia (23), the Philippines (20), and Australia (18). The number of new outgoing IPCA cases has almost doubled since FY 2006, from 642 to now 1,135.
In addition, in FY 2009, the USCA received 324 Convention applications concerning abductions to the United States from U.S. Convention partners, involving 454 children. The ten partner countries with the highest incidence of reported abductions from a foreign country to the United States were Mexico (75), the United Kingdom (31), Canada (29), Germany (18), Australia (14), France (12), Colombia (10), Argentina (8), the Dominican Republic (8), and the Bahamas (7), which together accounted for 212 cases or 65 percent of the total new cases.
During the same time period, 436 children abducted to or wrongfully retained in other countries were returned to the United States, including 324 from Convention partner countries.  In addition, 154 children wrongfully removed or wrongfully retained in the United States from a foreign country were returned under the Convention.