1o / 9 .(TIE) japan & Sri Lanka ( 4.30 inches ) 8 . china ( 4.29 inches ) 7 . Philippines ( 4.21 inches ) 6 . Taiwan (4.20 inches ) 5 . Myanmar ( 4.19 inches ) 4 . India ( 4.03 inches ) 3 . Thailand ( 4 inches ) 2 . Cambodia ( 3.95 inches ) & 1 . South Korea ( 3.80 inches ) ..... anyone notice that their ALL Asian countries , lol & did ya notice their isn’t any African countries here either , lol . anyway how’d ya like to have been a researcher working on this study ....... it’d be a dream job for Damian