statestics shows Number of worldwide internet users in any available following years (2015, 2016, 2017)

statestics shows Number of worldwide internet users in any available following years (2015, 2016, 2017)

previously I did paper that shows some elements that affect entrepreneurship growth, I found all information in GEM website. now I need the same process but for ( Number of worldwide internet users ) so could the writer find a trust website that provide statistics information about internet users and find out the methodology used to collect the data then make table with clear definition, questions that used in the survey, the average of each country.
I will attach my work as an example.