Here's one site that puts it at 1%.
http://www.family.org/cforum/fosi/bi...s/a0027730.cfm
I know Mods like us posting the content, but the text of the site has some weird dimensions.
At any rate it was hard finding an accurate way to word for the search on google. Most of the sites that came up were all pro-life sites, which I'm sure most of you would consider biased. But the fact is it is accurate.