2006 was undoubtedly a good year for Informix with double digit revenue growth in the first 3 quarters of 2006. This trend continued in Q4 with another quarter, and hence year of double digit growth. To quote Cindy Fung, Worldwide IDS Product Manager: "We hit way out of the park in Q4".
IBM's official quarterly earnings report (which reports Information Management as a whole) is published here: http://www.ibm.com/investor/4q06/4q06earnings.phtml.
Informix 2006 Results