Answer
Sample graph:
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Work Step by Step
From 1992 to 1995, the volatility had an average rate of change of 0.
So, the value in 1992 equals the one in 1995. Plot $(1992,1.1)$ and $(1995, 1.1)$ and join with a smooth curve. The connection does not have to be a straight line segment (we do not know how the index behaved in-between the borders of the period).
From 1995 to 1998, the volatility increased from $1.1 $to $1.1+ 3\times 0.2 = 1.7$ points. Plot $(1.998,1.7)$ and join with a smooth curve.
