I don't immediately know the answer to this question, but the following quotation about the spread of the internet might be of interest.
It was in
The Economist
A survey of technology and development
10 November 2001
The spread of technology among the poor
Information and Communication Technology is spreading faster than any technology in the whole of human history. In 1900, 24 years after the telephone was invented, only 5% of homes in America
were hooked up to the telephone network. In most other countries the figure was negligible.
Compare this with the spread of the Internet.
In 2000, 18 years after the creation of a rudimentary Internet and 11 years after the beginning of the World Wide Web, 6.7% of the world's population
were logging on. In other words, the Internet is spreading round the whole world faster than the telephone spread around its richest country a century ago.