The given line graph represents how different numbers of
cases
of whooping have been reported from 1940 to 1990 in Britain.
From the graph, we can tell that the highest Use synonyms
number
of Use synonyms
cases
of whooping cough was reported in 1941, which was about 170,000 Use synonyms
cases
. The Use synonyms
number
of reported Use synonyms
cases
had quite up and down until vaccination began in 1956. From the year of the beginning of vaccination, the Use synonyms
number
of reported Use synonyms
cases
rapidly decreased until it recorded almost 0 in 1972. Use synonyms
However
, its Linking Words
number
had a little bit of up and down when the rate of vaccination was low, remaining under 60,000 Use synonyms
cases
. Use synonyms
Finally
, Linking Words
cases
of whooping cough in Britain were barely reported since 2000.Use synonyms
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