The WMO concludes:
Distinguishing between natural climate variability and human-induced climate change will also require datasets that are more complete and long-term. A decade is the minimum possible timeframe for detecting temperature changes.
But this didn’t stop the WMO from earlier noting:
The warmest year ever recorded was 2010, with a mean temperature anomaly estimated at 0.54°C above the 14.0°C baseline, followed closely by 2005. The least warm year was 2008, with an estimated anomaly of +0.38°C, but this was enough to make 2008 the warmest La Niña year on record.