If the answer you are expecting is correlation, then you are wrong. Correlation refers only to linear relationship between two variables.
The correlation for any even relationship over a symmetric domain will be 0. Thus, if y = x2 between the values -a < x < a (for some a), the correlation between y and x will be 0 but few would contend that there is no relationship between the two.
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There is an inverse relationship between the datasets.
There is no correlation.
Regression.
bar graph
to show the relationship between 2 sets of data