The first survey offered average counts data while the remaining three were used for data on admissions. (canadianlawyermag.com)
As a result, there is not much we can say about long - term patterns, except that the annual average count of all but the weakest tornadoes has not changed for more than half a century. (newscientist.com)
Last winter's annual monarch census in Mexico reported the lowest population estimate on record, suggesting numbers of the insects could be down by as much as 80 percent from average counts over the past 15 years, Flockhart said. (scientificamerican.com)