In preparation for a piece I am writing I tripped over the following graphic in the OECD's recently published report on Measuring the Digital Economy:
Average data storage cost for consumer 1998-2012
It just had to be replotted onto a log scale so I could actually see what was going on - yup darn close to a straight line (that'll be one of them thar Moore's Law things). §
However, a big open data hoorah! and 1000 Internets to the folks at OECD who have published all the data for the tables and graphs in their reports so that I was able to do this. Long may this trend continue.