Rahul Choudaha on his blog DrEducation gives highlights of comparative chart showing "worldwide certificate attainment" of students registering for HarvardX and MITx. For example, 

• "World map of gender composition: 28% of registrants from Oman for MITx were female; higher than Germany (25%)."
• "World map of enrollment: 5,100+ students enrolled from Ghana for HarvardX."