"... chart ... shows that 60% of journals allow the final peer-reviewed version of an article to be archived immediately, with a further 27% permitting the submitted version (pre-print) to be archived immediately. Only 13% of journals do not allow immediate archiving, but moving away from the ideal of immediate open access, the situation changes once any embargo periods have expired. ... The most common embargo period is 12 months, followed by 6 months, and then 24 months. A few embargoes are longer, the maximum recorded in RoMEO now being 5 years. ... On the date the data for these charts was compiled (15th Nov.2011), the RoMEO Journals database held about 19,000 titles."
"... chart ... shows that 60% of journals allow the final peer-reviewed version of an article to be archived immediately, with a further 27% permitting the submitted version (pre-print) to be archived immediately. Only 13% of journals do not allow immediate archiving, but moving away from the ideal of immediate open access, the situation changes once any embargo periods have expired. ... The most common embargo period is 12 months, followed by 6 months, and then 24 months. A few embargoes are longer, the maximum recorded in RoMEO now being 5 years. ... On the date the data for these charts was compiled (15th Nov.2011), the RoMEO Journals database held about 19,000 titles." 
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