The charts show the proportion of holidaymakers of one region staying in different types of accommodation in three different years.
I believe you find your answer in the first sentence of Sample Answer 1:
The pie charts compare the ratio of holidaymakers from a region who used different types of lodging in 1965, 1985 and 2005.
Or in the first sentence of Sample Answer 2:
The pie charts outline the percentages of holidaymakers from a particular region...
However, it's a terrible example because:
- It introduces the notion of a "region" that is not contained anywhere in the pie charts.
- It's redundant because the assumption would be that a holidaymaker can only be from one region.
On a side note, pie charts are a terrible way of communicating information about data, especially when you're trying to make comparisons across years. It's much more clear to use a bar chart for a single year:
and especially for more than one year: