I'm not saying I necessarily prefer tribalism. Or that there aren't plenty of things Labour can be blamed for, because I'm sure a lot of the current inefficiencies are things that have existed from long before the coalition government stepped in.
But at the same time, it's not particularly difficult to see why people will put the majority of the blame on the party who have been in government for nearly a decade now, and who are ideologically driven towards lower taxes and a smaller state in a time when the NHS also happens to be struggling. And again...simply putting more money into the NHS isn't necessarily a catch-all solution that's going to fix all of its problems, but at the same time it's easy to see why people are sceptical when we look at broken pay cap promises, and Hunt's tone deaf handling of the junior doctor strikes, and things like the Tories insisting we need a seven-day NHS when we already have one.
And voters need to step up themselves. From a financial standpoint, in how they look after their own relations (social care), and with regards to personal health.
Figures aren't bang up to date but the trend is obvious.
They are also somewhat misleading. For example, what were Labour's intended spending commitments for the NHS during the period 2010-2017? IIRC, both Cameron and Clegg pledged significantly greater sums then did Miliband in 2015. Whereas last year, Corbyn proposed to spend billions in excess of the rest (although still short of what the NHS claims it needs).
How much of the spending from 1997-2005 was effective in the long run: PFI indebted hospitals, botched computerisation attempts, layers of middle management which were ultimately removed, community hospitals closed in favour of expensive monoliths e.t.c.
Additionally, many of those countries further up the graph supplement their health expenditure with a higher proportion of private funding (blasphemy for NHS orthodoxy).
I think a good starting point for Health and other ministerial departments in the future, would be some % of GDP minimums. We already observe one for DfID, and sort of do so with Defence if barely.