The chart gives information about the percentage of fresh graduate who recruited ...
It is a good opening sentence, but you'd better present this with a passive form.
Let me give a try:
A clear comparison of the number of graduated students recruited as English and French language teachers in Ontario from 2001 to 2007, a 6-year period is presented in the line graph. The data is measured in percentage.
Overall, although, both of them started in the almost same level, but ...
You need to polish this to gain better language.
Overall, there was significant differences in the number of teachers recruited in the initial year. A marked change was seen in the figure for English-language teachers showing a considerable decline in the end of the period. The converse would be true for the bracket for French-language ones.
a heap of luck :D