XML vs JSON : What does google insight say?

Just stumbled upon Google insights. A very interesting perspective on search statistics.

It shows the decline of XML and rise of JSON.

Update: As per one of the comments on HN, the scales of two graphs are not same, so xml enjoys the bigger volume but is on decline.  The intent is to show the relative search trends ( which kind of reflect the popularity, you may argue not always, but mostly it does)

XML Trends:

JSON Trends:

So it is Google who writes history now.