Searching through the Center for Dease Control's web site, I could not find any statistics on Life Expectation based on Occupation. Ironically, occupation plays a major factor in one's life expectancy. So, I'm sure that the data for your questions are some where out there.
Personally I work on retirement plans. The closest mortality tables I have ever seen that are based on occupation, are white-collar workers vs. blue-collar workers. Unfortunately, these were very old tables and probably not as relevant anymore due to changes in the laws and workplace safety.
Here are some links on this stuff for those of you who reside in the States:
[
www.cdc.gov]
[
www.mortality.org]