Describing Pie Charts (2) - Making Comparisons
If two or more similar pie charts are displayed, you can make comparisons
This chart shows the relative size of populations of countries of the European Union in both 1998 and 2007. In this case we can make two sets of comparisons:
- We can make comparisons between the countries in each year.
- We can make comparisons between the two years (i.e. examine any changes from 1998 to 2007).
In this case, we'll look at comparisons between the two years.
The first thing to notice is that there is very little change: all changes amount to less than 1%.
The second change to notice is which countries' populations grew (as a proportion of the whole) and which countries' populations shrank.
You can see that both Germany's and Poland's populations share of the European Union's Population fell from 1998 to 2007 ( from 17.1% to 16.6 % and from 8% to 7.7%, respectively).
The percentage populations of the other major countries of the European Union grew in this period. The largest growth in population share was that of Spain which increased its share from 8.3% to 9%. Both the UK's and Italy's share of the EU population grew by only 0.1%.
In spite of the change in Germany's population share, it remained the largest population of the European Union.
Note that you CANNOT say that Germany's population fell or that France's population grew. These charts only show population share, not population numbers.
The following table shows actual population numbers:
As you can see, in all these countries except Poland, the populations increased between 1998 and 2007.