How far back do you know your family?

Another question brought this to mind. How far back does your family history extend? Do you know where your ancestors came from or were born?
To me it seems we are losing the history of our individual families and I am not sure whether it is no longer being handed down because it no longer of any importance or value in our societies or whether it has to do more with negligence brought on by distance.

I know all eight great grandparents but only 14 out of 16 (87.5%) of my great, great grandparents although (full disclosure) one of those is by given name only, I do not know her maiden name. Beyond that it gets even more difficult, 20 out of 32 (62.5%) great, great, great grandparents and 20 out of 64 (32.25%) of my 4xgreat grandparents.

On my wifes side it is 100% for the both the great and the great great grandparents, 43.75% (14 of 32) for the 3x great grandparents and 29.7% (19 of 64) for the 4x great grandparents.

Is this about where you stand with your family?

I gained this knowledge not by it being handed down but through my own research