Rate of growth of traffic at the Amsterdam Internet Exchange

Here's a great historical graph, from page 28 here, showing the growth in traffic at the Amsterdam Internet Exchange.

By my take off from this graph, there was 1000x growth in nine years.  That means traffic doubles every 11 months.  While this is only one data point, it's new to me and fairly up-to-date.  It's also roughly consistent with the 12 month doubling rate mentioned in my earlier post.