How much of the worlds energy is produced by nuclear power?
No context provided
What percentage of the worlds energy is produced by nuclear power in 2017?
4.9%
No context provided
What percentage of the worlds energy is produced by nuclear power in 2014?
11%
No context provided
What percentage of the worlds energy is produced by nuclear power in 2016?
5%
World energy consumption
https://en.wikipedia.org/wiki/World%20energy%20consumption
World energy supply and consumption is global production and preparation of fuel, generation of electricity, energy transport and energy consumption. 
World energy supply and consumption
World energy supply and consumption is global production and preparation of fuel, generation of electricity, energy transport and energy consumption. The percentage of the world's energy produced by nuclear power has varied year after year. In 2014, global nuclear power usage was at 11%. In 2016, the percentage was 5%. The year after, in 2017, the percentage dropped slightly to 4.9%.