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This shows the population of the collared dove (second column) as it spread throughout Britain from 1955 to 1964. Data from "The spread of the Collared Dove in Britain and Ireland" by R. Hudson, British Birds, Volume 58 No 4, April 1965, 105-139.

1st col	2nd col
1955	1
1956	2
1957	6
1958	15
1959	29
1960	58
1961	117
1962	204
1963	342
1964	501