Life expectancy and health care spending per capita

Over at the blog Consider the Evidence (see here) Lane Kenworthy has a very interesting graph that shows trends in life expectancy vs health care spending per capita (see below, click to enlarge).

Mr. Kenworthy says:

Our gain in life expectancy per additional health spending is much smaller than in other countries, particularly after the early 1980s when we reached expenditures of about $2,500 per person (in 2005 dollars) and life expectancy of around 74-75 years.