The in-migration that happened in the middle of this decade certainly had a lot to do with the housing boom.
We want to problematise and complicate this idea of migrations as something that happens separately from the human experience.
"Simultaneously, movement and residency were much less restricted, so all of a sudden the government couldn't control the rural-urban migration that usually happens when an economy is liberalised".
During the ensuing three weeks, McWha and his helpers tossed about 20,000 fish over the dam, allowing them to continue a migration that usually happens every March and April.
Migration is not only something that happens to the cities any more.
"If you look back 10 or 15 years no one was really talking about Eastern European migration at the time, and would not have predicted the scale of migration that would happen after 2004.
"These are present-day individuals, but we're trying to capture the world as it was before the massive transcontinental migration that's happened over the last 500 years," Kasia Bryc, a population geneticist for the company, explained.
Community female interviewers visited every household monthly up to 2006 and bi-monthly from 2007 to record vital events (births, deaths, migration, marriages and marital disruptions) that happened since their last visit.
Since then every household in the surveillance area has been visited by a trained interviewer every 4 months to record pregnancies, pregnancy outcomes, deaths and migrations that have happened since the previous visit.
