What is the average and range of business investments in Knowledge Management?

Please express as a percentatge of annual revenue, e.g., "Companies
invest  average X-XX% of annual revenue on knowledge management." (I
am particualaly interest in service and consulting companies, both
medium and large.)

The answer MUST be referencable.

Knowledge management consists of all systems, process, people and
methods use in the enterprise for learning, unstructured data,
communications (phone, email, IM, Fax, etc), collaboration and
increasing the overall knowledge of the firm.

It does NOT include the transactional systems (accounting, payroll,
benefits, etc.) from IT.

Is money spent on advertising and public relations "knowledge
investment"? Are you asking about The USA or some other group of
countries? Should we define medium as more than 10,000,000 US dollars
annual revenue?  Since you specified "company" should we assume that
partnerships, sole proprieters, government bureacracies, and not for
profit organizations should be excluded? How is unstructred data
different from other kinds of data?
 The last paragraph seems to exclude almost everything, as most
activities are related to transactional. Also you should name some
other things which might be reguarded as etc. Are IT investments in
knowledge to be excluded even if they are not transactual?  Neil