It's actually more like half their population. I'm sure that figure is the total population which includes the immigrant workers.
Well I was using the wikipedia census figures.
Well if Wiki is your huckleberry:
In April 2001, the country had a growing population of approximately 907,229 people,[9] of whom approximately 350,000 were believed to be citizens.[28].
The majority of the estimated 550,000 non-citizens are individuals from South and South East Asian and Arab countries working on temporary employment contracts in most cases without their accompanying family members. Most foreign workers and their families live near the major employment centers of Doha, Al Khor, Mesaieed, and Dukhan.
The figures speak for themselves.