When were the major waves of Chinese immigration?

Currently Canada is known as a country with a broad immigration policy which is reflected in Canada's ethnic diversity. According to the 2001 census by Statcan Canada has 34 ethnic groups with at least one hundred thousand members each, and numerous others represented in smaller amounts. 13.4% of the population belonged to visible minorities: most numerous among these are Chinese (3.5% of the population), South Asian (3.1%), Black (2.2%), and Filipino (1.0%).