Fixing units for interest rate chart.
Fixing units for interest rate chart.

It was in range [0,1], but it is more readable and consumed by humans in
the range [0,100]%.

Graphs already add the '%' unit, so all that was missing was multiplying
by 100.

(related to #2)

danielfireman/isumm,danielfireman/isumm,danielfireman/isumm