Health care spending in the US was tracking with countries like Germany, Denmark, Sweden (increasing from 6% of GDP to 8%) throgh the 70s.
After 1980 US really took off though. In 1980 US spend 8.2% of GDP, Germany 8.1%, Denmark 8.4%
By 1990 US was 11.2%, Germany and Denmark 8%
US plataued in 1993 about 12%, lasting until 2000 when it took off again, reaching 16% in 2009, then was mostly flat (slightly reducing) until 2013.