I have been searching for this for quite a while. UNESCO had it--click here to see it on their website. I include the graph here--click on the image to see a larger version.
The number of tertiary education students has grown from 68 million in 1991 to 132 million in 2004. That's a doubling over a 14 year timespan. That's a compound annual growth (CAGR) rate of 4.85%, which would lead to a doubling every 14.64 years. It's a third of the growth rate we would need to double every five years.
This is daunting. We see the world university student population mirroring the growth rate of India since 1947, when what I think everyone assumes is a growth rate similar to China's.
I don't think this is adequate growth to sustain a required expansion of conventional infrastructure, let alone power a Singularity.
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