BGP policy: US as transit

US transit for 71.5% of paths (not traffic!)
100% to MX, 98% to peru, chile
80-90% for cn, hk, tw, au, nz
for most paths, US only 3rd party
2nd biggest transit country: canada
AU provided transit for 46% of all paths to NZ
0 means < 1% (blank means 0)

      all   AU    CA    C_H   JP   KR   MX   NZ  SEA  SWA   TW    US
____________________________________________________________________________
US  71.5  77.8 82.0 90  49.5  61.6 100  79.6  63.0  97.8   83.5
CA  13.3   8.3          4.9  37.5   2.1                27.5  22.3   1.3   0.2
AU   2.8                 18.4                        46.1   1.6              0.4
JP    1.2          1.4    7.4        10.5            12.0               0.3
NZ   0.9   3.7
EUR  0.7                2.1        1.7               4.2  27.0
UK   0.7   0.0   0.0         0.1              0.0    5.8  21.1         0.2
SEA  0.3   0.7           5.6
AR   0.1                                                   5.2
AE   0.1                                             1.9
CH   0.1                                                   2.8
MM  0.1                                             1.6