The chart would be much improved if a longer time series is included giving us values for each year. It's pretty clear that this data is subject to sudden jumps (e.g. Armstrong's death) and so picking arbitrary years will likely cause is to miss important events.
Read more after the jump.
Circles are also subject to various types of optical illusion. Before you use bubble plots, give the following a look:
Can we judge the size of circles in relation to other circles? (credit)
Can we judge the relative distance between circles? (credit)
Can we judge the relative sizes of circles within circles? (credit)
Or another Example:
Here's a 3D column chart:
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