求翻译：下表显示了从1991年到2011年该校大学生所购买的书籍类别的变化，科学和小说类别的书籍比例逐年下降，而计算机类别的书却在逐年增加。是什么意思？

The following table shows the changes in the types of books purchased from 1991 to 2011 school students, the proportion of books of science and fiction category is declining, and computer classes book has increased year by year.

The following table shows from 1991 to 2011 the School of the university students have purchased the books category changes, the science fiction category and percentage of the books has been declining, and the computer is in the book category increased year by year.

Next extolled has shown from 1991 the books category change which this school university student purchased to 2011, the science and the novel category books proportion drops year by year, but the computer category book year by year was increasing actually.

Following table shows from 1991 to 2011 the changes of college students buying books category, Scientific categories declining proportion of books and novels, and books of computer category are on the increase year by year.

正在翻译，请等待...