An article in Forbes gives the following numbers, which I reproduce here in their simplified form:

+------------------+-------------------+--------------+----------+
| Energy Source    | Mortality Rate    | % global     | % global |
|                  |(deaths/10^12kWhr) | electricity  | energy   |
+------------------+-------------------+--------------+----------+
| Coal             | 100,000           | 41%          |          |
| Oil              | 36,000            | 8%           | 33%      |
| Natural Gas      | 4,000             | 22%          |          |
| Biofuel/Biomass  | 24,000            |              | 21%      |
| Solar (rooftop)  | 440               | < 1%         |          |
| Wind             | 150               | 2%           |          |
| Hydro            | 1,400             | 16%          |          |
| Nuclear*         | 90                | 11%          |          |
+------------------+-------------------+--------------+----------+


* The nuclear number includes Chernoble and Fukoshima.

The New Scientist calculated the number of deaths per kilowatt question based on the data from International Atomic Energy Agency in 2011.

According to the New Scientist:

The agency examined the life cycle of each fuel from extraction to post-use and included deaths from accidents as well as long-term exposure to emissions or radiation.

They concluded that "fossil fuels are far deadlier than nuclear power" and that "the large number of deaths [related to fossil fuels] are caused by pollution." A graph that summarizes the findings follows:

Another, more recent, report supporting these numbers can be found at the World Nuclear Association, here.

The New Scientist calculated the number of deaths per kilowatt-hour question based on the data from International Atomic Energy Agency in 2011.

According to the New Scientist:

The agency examined the life cycle of each fuel from extraction to post-use and included deaths from accidents as well as long-term exposure to emissions or radiation.

They concluded that "fossil fuels are far deadlier than nuclear power" and that "the large number of deaths [related to fossil fuels] are caused by pollution." A graph that summarizes the findings follows:

Another, more recent, report supporting these numbers can be found at the World Nuclear Association, here.