MSDS come up all the time in threads but everyone should remember they are written to give emergency responders and firefighters information to clean up spills. As someone who wrote many of them for a large company, they are specifically not to divulge any proprietary information. In fact, where possible they are written to conceal such information - and if in the process are also misleading in that way, all the better.
Specific percentages of certain components are unimportant in an MSDS as you've seen.