It's not a matter of maturity. Many organizations hide behind the disclaimer "we are not an I.T. company", despite having sizable I.T. departments. And despite having this sizable department, which offers mission-critical applications and infrastructure, zero effort is made towards working smarter. Problems are fixed with mandatory overtime, cutting staffing/costs, and "quick-and-dirty" fixes to long standing problems.
I think some companies are starting to understand that their project management methodologies are flawed, but most cannot connect the concepts of "software debt" to decreasing marginal output in their I.T. efforts. An hour of work today is less effective than in the past because you are paying "interest" on your previous bad decisions.
I think that the 27% is reflective of companies that can connect the longevity and cost-effectiveness of I.T. systems to proper project planning, management, and I.T. expertise. Whether or not this is an upper-bound remains to be seen, because a lot of organizations simply don't understand that inventing your own project management ideas dooms you to repeating the same failures that have happened over the last 50 years.