Average of 10 fastest women's marathon times by country so far this year:
world 2:15:08
ETH 2:16:02
KEN 2:17:37
JPN 2:23:19
USA 2:23:59
BRN 2:25:58
CHN 2:26:51
MAR 2:26:55
GBR 2:27:36
GER 2:29:01
AUS 2:29:24
ESP 2:31:50
FRA 2:32:33
CAN 2:33:28
ITA 2:33:32
PER 2:34:00
RUS 2:35:17
PRK 2:35:22