Something to keep in mind is that these statistics are very old... I think suicide is the kind of thing that is probably profoundly affect my our socially constructed values. Our values are very different between now and 10-39 years ago. Suicides among dentists can be higher than physicians (I am not saying that they are, just saying if they were) due to various factor (though I don't have any statistics to back it up).
But, I would think suicide rates now are lower post 2000~ since we now have better drugs and therapies for treating suicide-contributing-factors like depression.