Have look at this...
256919 6 minutes 128 1,507.06 BTC 98.201.114.81 51.29
256918 10 minutes 394 2,971.58 BTC 176.255.75.174 166.18
256917 19 minutes 408 3,895.86 BTC BTC Guild 147.28
256916 30 minutes 302 1,653.08 BTC 176.255.75.174 115.40
256915 36 minutes 281 1,229.68 BTC 64.136.242.202 104.98
256914 39 minutes 692 7,915.62 BTC 98.201.114.81 240.06
256913 1 hminutes 333 6,473.08 BTC 60.29.146.165 170.03
A sample size of 7. Clearly you've done your research.
i have been studing economics and statistics.
Please remind me such event in the past. This is an indicator of new era. Community mining is shrinking...