This index value plot shows the official interest rates in India, from 1690 to 2009, according to the Bank of England.
An index value plot is a line graph which shows the frequency of change of a single variable, by a single line, over a period of time. If there are multiple variables, there will be multiple lines, and for ease of interpretation, the lines will be of different color and have a legend which states the variable's definition or category. In this map; the frequency moves vertically and is measured on the vertical scale on the left, and the change in time is indicated by the line's horizontal movement and is represented by the scale at the bottom of the map.
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