Excellent introduction :)
There are a number of reasonsbehindas to why professionals leave their own country.
. The most important reason being the financial issues has made a significant number of movements during the last decade.
... I guess you can improve its presentation;
Financial benefits had been the most important reason for such migrations during the last decade.I guess you need to give more specific examples for the reasons. In your first body para, I don't find such specific example. My advice for you is to limit the number of reasons to one for each body para and support that with a more specific example. That helps you manage time for this task too. For the above reason, you could have said;
A doctor of a developing country may be paid about five times more than what he is paid in his own country if he moves to a developed country.Overall, a good essay and you show excellent writing skills :)