Applicants from any single 'country of chargeability' cannot exceed 7% of the total number of available employment-based green cards in a year [1].
In practice, someone from Iceland or Tuvalu can get an EB (category 2) visa in about a year, whereas the average for someone from India or China is more like 5-6 years [2].
In practice, someone from Iceland or Tuvalu can get an EB (category 2) visa in about a year, whereas the average for someone from India or China is more like 5-6 years [2].
[1] http://www.uscis.gov/tools/glossary/country-limit
[2] These rough numbers are from observations on http://www.trackitt.com, where applicants self-report application statistics