Well it happens in the 3rd world, sharing hospital beds 
The Welsh government are doing their best to provide as much funding as possible for the NHS - but due to Tory cuts, many other things are set to suffer - libraries, youth services etc etc Because Welsh Labour government are prioritising Health and Social Care. Wales is not privatising and does not have its hospitals working in relatively small Trusts. Instead, large health boards. Wales does however have a high level of demand because the population is poorer and therefore sicker.
Thanks for the 22 year old link Bags
. I think it's safe to assume that the graph carries on rising in countries like the UK, where life expectancy is steadily rising and therefore the need is rising sharply. We probably all know people who have had all kinds of expensive treatments form the NHS during their 70s and 80s. Or multiple hospital admissions. Or repeat prescriptions that come in a full carrier bag. If we had had a sharp dip in the birth rate after the war, the NHS would not be needing additional funding now.