According to US Navy PIPS2 maps, the area of thick Arctic ice has more than doubled, and the volume of Arctic ice has increased by 26% – since 2008. You can see from the graph below that ice thickness distribution has shifted dramatically to the right since the same date in 2008.
You can also see why NSIDC only likes to talk about 4+ year old ice. The reason being that it will take another two years to recover from the 2007 low.
The blink comparator below shows growth of ice greater than 2.5 metres thick.