Have you ever tried writing several different introductions for the same question? It's a useful exercise. Take this question for example:
The table below shows the proportion of different categories of families living in poverty in Australia in 1999.
(Cambridge IELTS 4, page 31)
Here are 3 introductions that paraphrase the question in different ways. Notice that I sometimes use words from the table to help me.
1) The chart compares percentages of Australians from six different family types who were classed as poor in 1999.
2) The table gives information about poverty rates among six types of household in Australia in the year 1999.
3) The table compares different categories of Australian families in terms of the proportion of people living below the poverty line in each one.