How many years of experience should I list in project management?

Hi,

I have 19 years of IT experience. In many of my jobs during that period, I have run projects some of the time. However, I am learning to use a more standardized approach like the PMBOK now. how many years of Project management experience should I claim to have?

TIA
Almost each year there are several small projects, maybe lasting about 10 to 15% of my work time. Then, on maybe a dozen occasions over the years, there are projects lasting 4 to 9 months but not consuming all my time

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