File:Gregorian calendar - Chart of national adoption dates - after Wikipedia (vertically ordered & compressed).png

This image is a draft for comment. It is a modified version of: http://upload.wikimedia.org/wikipedia/en/timeline/dedacdd98afe98ff1d0563a54844a788.png rendered from plot data at http://en.wikipedia.org/wiki/Gregorian_calendar "Adoption outside of Roman Catholic nations" License is.