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 According to the chart given above, as far as I am concerned, with the rapid development of the science, technology and economy, as for the hours of using computer, 1995 is as two times as 1990, 2000 is as five times as 1995, the whole trend is increase fast. The reason as follows.

    At the beginning, as we all know, the computer producing is very common nowdays, thus computer price is lower than ever before. Moreover,  most of the students on campus who always use computer to check information for their study. Furthermore, they use computer to relax themselves for entertainment, therefore, the spend a lot of time on computer usage.