Some of this site is modelled, which means some of it will eventually be wrong. If a number here
disagrees with a government source, the government source wins and the page gets corrected.
A wrong number — corrected as soon as it is confirmed.
A disputed assumption — we will not always agree, but we will say so publicly and explain
why, rather than quietly leaving it.
A better source — always welcome. Primary government data beats anything we derive.