Poll on adding oil between oil changes

[Fyeganeh]

I was wondering how often do people have to add oil between oil changes. Things that might be useful are model year, s vs base, how many miles on car, how many months between oil change, how many miles between oil change, do you have to add oil between oil changes - how much and how often/how many mile.

So here it goes:
2000 base Boxster with 62500 miles, change oil every 6 months about 2000 miles between oil changes, don't need to add any oil, oil level doesn't drop much at all maybe one notch at most or not at all on digital readout. Used to change yearly until IMS update, never have had to add oil. Have had car for coming up to 16 years.