Given the Following Time Series,compute the Seasonal (Quarterly)indexes,using the Four-Quarter
Given the following time series,compute the seasonal (quarterly)indexes,using the four-quarter centered moving averages. 
Definitions:
Proxy Materials
Documents that are distributed to shareholders in preparation for shareholders' meetings, usually including information necessary for making informed votes on corporate matters.
Shareholders
Individuals or entities that own shares in a corporation, giving them certain rights and interests in the company.
Annual Meeting
A yearly gathering of a company's interested shareholders where directors report on the year's activities and shareholders vote on various issues.
Proxy
A writing signed by a shareholder that authorizes the individual named in the writing to exercise the shareholder’s votes (corresponding to his or her shares of stock) at a shareholders’ meeting.
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