I don't think those values can be interpreted like that.

They are some type of "trend indicator values" that "do not represent real financial flows but are a crude instrument to estimate volumes of arms transfers, regardless of the contracted prices, which can be as low as zero in the case of military aid".

I'm pretty sure the US exports for sale dollar amounts much much more than anyone else does.

There is also the question of the graphed "value" of small arms vs larger systems.