Click to enlarge. Data source: Internet World Stats - www.interenetworldstats.com

Brief analysis:

1. Although all nations have experience rapid and substantial growth in Internet penetration rate (basically, the number of Internet users), the single-digit numbers are still very small in comparison to the world average. Statistically speaking, a twelve-fold change from 0.4% to 5% in a matter of 8 years is quite substantial. However, the mean world penetration rate stands at 25%, and North America is at nearly 74%.
2. Northern African nations (Algeria, Egypt, Morocco, Tunisia) are some of the most connected in the entire continent. All have Internet penetration rates over 10% (the African average is 6.7%).
3. The number of Internet users in Angola since 2005 has not kept up with the population growth.
4. All African nations arrived late to the Internet world. Ten years ago, only one country (South Africa) had a penetration rate over 1%.