Not dived into this... Who knows... But 2020 and all that...
https://www.factwire.org/investigati...-data/?lang=en
The differences caused by each year’s revisions are magnified by accumulating data across multiple years. FactWire calculated two different versions of cumulative growth from 2011 to 2019, by using sets of data from the NBS. One set of data was calculated from the unrevised amounts of 2011 and 2019, and the other set of data used the growth rates based on revised data from the previous year. Both sets of data – the unrevised amount and the growth rate based on revised data – were obtained from the official NBS notices.