This video from England says about itself:
15 December 2014
Translated from Wageningen university in the Netherlands:
Monday, April 13th, 2015
Again, Dutch beekeepers have lost last winter on average comparatively few bee colonies: about 10%. This means that winter mortality, measured in early April, now for three years in a row has been around 10% (respectively 13%, 9% and 10% in 2013, 2014 and 2015). This is the outcome of a telephone survey of beekeepers carried out on 2 April by the Dutch Beekeepers Association (NBV) and bee researchers from Wageningen university.
Winter mortality among bee colonies has for years been alarmingly high. There were winters that one out of four colonies did not survives. Fortunately, the most recent winters shows that the mortality rate is lower now.