99% of the time, the "time dimension" goes along the x-axis (the "independent" variable) and the other ("dependent" variable) along the y-axis; the "numbers" in your case.

In your case, you will probably drop the "NAN" entries.

You would need to "scale" the numerics (by dropping the exponent; for example).

As with $, you chart in thousands, millions, etc. to get the chart "looking right", but still reflective.

And as Richard alluded to, you'll probably divide the x-axis into "quarters" or "years" in order to accomodate all the detail.

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