.... hey ... there's nothing at all .... give another try using "Attach file(s)" tool in the Message block.
The given chart illustrates the ratio of men and women who held the different sorts of post-school certificates in Australia in 1999.
This seems to be a good introduction. But without seeing the graph I cannot validate what you've written in it :D
Firstly, there were a vast difference in the level of skilled vocational diploma that females held only 10% qualifications while males had 90% documents. however, the ratio of men and women were almost equal in bachelors degree which 51% and 52% respectively.
.... Before this, write an Overview which gives an overall idea about the graph. It should speak about the main trends, but very briefly and without the details. Don't have details like percentages and other data in an Overview.