Does composite index of NYSE represents chaos in the long time scale?

Here we analyze the Composite Index (CI) for 32 years, from 1966 to 1997 of the New York Stock Exchange (NYSE). Individual share prices may be unpredictable—is it true for CI also—particularly in the time scale of 32 years? In the first half (consisting first 16 years) CI is confined to values in the range of 36–75 and in the second half, it rises to 600 point mark. Non-linear analysis of data confirms that CI is not unpredictable in longer time scales. Moreover, the second half of the data fits well with some growing function of time.