Cashless Carnival

The NY times has an article about the number of US H1B visa applicants this year. The article also lists the top 10 IT companies in terms of the number of H1B visas requested. What I find really surprising with the list is the stark difference between the number of visas requested by Infosys vs. TCS. How is it possible that TCS, which has higher revenues than Infosys [and hence more number of employees], has requested for 7,500 visas and Infosys has requsted for thrice that number? 

Am I missing something here? OR, Are the numbers actually hinting a different story? [I am just thinking aloud] Say .. Attrition in the US, the amount of business both these companies do in the US, or is it reflecting the brilliant operational efficiencies TCS has attained?

Any thoughts?