Here is an article about an apiary that has a 90% survival rate. (Not clear to me whether this is an annual or winter survival rate; however it is impressive none the less) The article indicates they select for hygenic behavior by a somewhat detailed procedure.
Editors Note: They appear to be doing what can also be done by purchasing Varroa Sensitive Hygenic (VSH) or USDA Russian queen bees.
http://learningenglish.voanews.com/content/saving-honeybees-one-hive-at-a-time/2969533.html
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