Hype notwithstanding, the computer industry has already been through a number of generations. IBM has roots in tabulating companies that began about 130 years ago.

Chart of the day: A decade of Apple ‘computer’ sales. BY Philip Elmer-DeWitt. Rankings. 100 Best Companies; Fortune 500; Global 500; Fortune 500 Europe; Most Powerful Women; Future 50; ...

This chart comes from a study by the international Organisation for Economic Co-operation and Development group. The OECD conducted a study of 215,942 people across 33 countries from 2011-2015.