Here's the same graph with "linux" and "news" added: http://www.google.com/trends/explore#q=software%20consulting...
Linux has gone down over time, while a generic term like "news" has gone up. I find it implausible that interest in Linux has decreased, but rather the internet is being adopted by more of the general population.
Numbers represent search volume relative to the highest
point on the chart, which is always 100. Hover over any
point to see the search volume at that time.The issue wting was raising is the definition of search volume. If search volume means "raw total number of searches", then the graph might support the OP's conclusion (if, e.g., we assume the population remained the same and that the same set of people aren't increasing the number of times they search for 'software consulting'). If, on the other hand, it means "fraction of all searches containing the term", then it might not because, as wting points out, the fraction of searches for 'software consulting' may go down due to a flood of searches for, say, 'honey boo boo'.
http://www.google.com/trends/explore#q=software%20consulting...