The US Postgraduate Ranking Report 2016 shows that postgraduate degrees in the US rose by 0.2% in 2017 to 27.1%.
The UK was the only other major country with a gain of 0.1% in the same year.
The new figures highlight the importance of postgraduate studies at universities across the globe, where the average postgraduate education in the UK rose by 5.7% to 24.8.
The new figures are based on the first three quarters of 2018, which included the first quarter of the year when the data is collected.
Postgraduate programmes in the United States also grew at a much faster rate than elsewhere in the world, with the proportion of graduates receiving a degree growing from 18.1 to 22.5% over the same period.
This growth is partly due to the growing popularity of the graduate degree, which was the third-largest source of income for graduates in 2017, accounting for 18.9% of total earnings.
A growing share of postgraduates earn their degrees in an engineering or technology field.
In 2018, engineering and technology accounted for 37.6% of postdoctoral degree recipients, with health and human services, education, and social sciences making up the rest.
In the US, the proportion is 20.4%.
The US Postdoctoral Ranking Report published on Sunday shows that the UK also grew its share of the US postgraduate population.
The UK gained a small but significant number of postdocs from the US and Germany, while the US grew by a small proportion.
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