China has changed the way it calculates GDP and guess how that played out in its revisions?
2012 GDP revised to 7.9% from 7.7%
2013 GDP 7.8% vs 7.7% prior
2014 7.3% vs 7.2% prior
2015 6.9% vs 6.8% prior
China says the changes mainly reflect the contributions of R&D spending.