That meter was pegged to slightly positive for most of 2012.
A reminder to people ENSO measurements are specific for an area at the equator…
When negative, to the point of La Nina, it tends to cool things and often brings some weather events in the US and other places.
Grumble, grumble, grumble.
You can see just about all the ENSO graphs and data you’d ever want at Anthony’s ENSO page.