Several origin ASes over time

   #) #or.AS  # Prefixes
   1)      1          130786
   2)      2               4901
   3)      3               1500
   4)      4                    96
   5)      5                    50
   6)      6                    16
   7)      7                    17
   8)      8                      5
   9)      9                      1
  10)     11                    1
  11)     12                    1
       Total          137374                            
6588 prefixes changed hands (origin or some of origins)
4220 prefixes were multiorigin (at least once)
3861 ( 91.49% of above) multiorigin prefixes also changed hands

multi-origin prefixes are highly dynamic, some may be
artifacts of convergence to a new origin at snapshot time