Within ten years trade had doubled between the two countries.
Production has more than doubled to 21,736 between 2000 and 2007.
The population in the town doubled between 1950 and 1960 (from 3500 to 7000).
The number of young children affected doubled between 1997 and 2002.
The population doubled between 1970 and 1977, to an estimated 232,300.
The population more than doubled between the 1960's and 2000 rising to over 600 people.
The number of films has also more than doubled between 1980 and 2000.
The town grew quickly; the population doubled between 1890 and 1900.
The city's population doubled to 60,000 between 1980 and 2000, the year of the most recent census.
As a result, the number of international migrants doubled between 1960 and 2005.
