In the latest Apis Newsletter from Malcolm T. Sanford a link http://www.mylovedone.com/image/solstice/win10/SammataroandArlinghaus.html
is given that provides a animated map of the spread of varroa across the globe 1904 through 2009.
It is very interesting how slow varroa spreads across Africa. A map is also available for Hawaii.
Maybe someone has already shared this link here, if not here it is.