Waits over a period of a year aren't all that useful, too low a granularity. When doing wait type analysis, you usually look at the difference between the waits a minute or two apart, that gives information on the current problems, which allows investigation into current problems.

Waits aggregated over months or years are just numbers with minimal meaning.

Oh, and there are waits that you should just ignore no matter how high the number is, often because said waiting processes are normal and expected and often background tasks.