There is a new paper out comparing country level productivity and national/international research collaborations.  It appears to have more of a policy agenda than anything, but folks might find it helpful. I've cut-and-pasted the bottom line below. 

Best,
Steve

“…there is a shift toward US-international collaboration instead of US-based research coupled with a decline in US-based research published in high-ranking journals (Figure 1). The increase in US-international collaboration is more obvious in high-ranking than
mid-ranking journals, suggesting that this trend is indicative of a decline in US discoveries instead of the adoption of a more collaborative research culture. Should this decline alarm US researchers and policy makers? The good news is that the US clearly
continues to lead in terms of its output and its investment in R&D (Figure 1, Tables 1 and 2, and refs. 2, 4, 5). However, stagnation of research funding in the US is a major concern that is compounded by year-to-year uncertainty in funding and the dependence
on annual budget approval by Congress. Although throwing money at a problem is not a cure, the investments in R&D that China (6) and South Korea (7) have made are paying off in publication output, while investments in R&D as a percentage of the gross domestic
product in the US and the European Union have been relatively flat for several years (7). If current trends in R&D investments continue, it is predicted that China’s support for research will exceed that of the US by 2022 (8).”

Globalization and changing trends of biomedical research output

https://insight.jci.org/articles/view/95206

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Stephen M. Fiore, Ph.D.

Professor, Cognitive Sciences, Department of Philosophy (philosophy.cah.ucf.edu/staff.php?id=134)

Director, Cognitive Sciences Laboratory, Institute for Simulation & Training (http://csl.ist.ucf.edu/)

University of Central Florida

sfiore@ist.ucf.edu

Author, e-mail: 
sfiore@IST.UCF.EDU
Author, name: 
Fiore, Steve