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Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands. Apply weights of .1, .2, .3 and .4, respectively, for the quarters. In a few words describe the trend in the number of subscribers.

31-Mar-01 28,766
30-Jun-01 30,057
30-Sep-01 31,336
31-Dec-01 33,240
31-Mar-02 34,610
30-Jun-02 35,102
30-Sep-02 35,308
31-Dec-02 35,203
31-Mar-03 34,386

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