Cool Data Alert: Immigration Policies Related to Low-Education Immigrants in 31 Countries, 1783-2010

Here is the data. And the official description: 

Immigration policy for low-skill immigrants, 1783-2010, for the following countries: Argentina, Australia, Brazil, Canada, France, Germany, Hong Kong, Japan, Kuwait, the Netherlands, New Zealand, Saudi Arabia, Singapore, South Africa, South Korea, Switzerland, Taiwan, United Kingdom, United States.