Some new information about the future (predicted) launch rate of Arianespace:
Arianespace and Astrium sign agreement on Ariane 5 production increase
February 15, 2007
Arianespace and Astrium Space Transportation have decided to increase the Ariane 5 production rate, with the company's two top executives confirming the output ramp-up by signing a declaration today in Bremen, Germany.
[...]
The agreement puts in place the investments needed to supply seven Ariane 5 ECA launchers per year, beginning in February 2008. It also provides the possibility to perform an additional mission annually in a specific Ariane 5 version – for instance to orbit the large Automated Transfer Vehicle (ATV), which is to service the International Space Station.
http://www.arianespace.com/site/news/feature_2007_02_15_index.html