Words-per-query on the rise

The number of words in the average search-query is increasing. No theories proffered for this, but I'd assume ti's because Internet users are, on the whole, getting more sophisticated in the way that they think about information storage, labelling and retrieval.

1. 2 word phrases 32.58%
2. 3 word phrase 25.61%
3. 1 word phrases 19.02%
4. 4 word phrases 12.83%
5. 5 word phrases 5.64%
6. 6 word phrases 2.32%
7. 7 word phrases 0.98%

Link (via Battelle)