Between in 1 in 7 and 1 in 8 in countries where women do not have any real access to modern healthcare. https://en.wikipedia.org/wiki/Maternal_death

1 in 20 (~50 in 1000) in the UK until 1940/1950. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1633559/

and lots of interesting reading here: https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1...