You can't go a game at 1300-1400 without a level 2 gank occuring. And it's almost always at top or mid. Heck, Numbers was ganked at mid 5 times within 5 minutes during one game.
Edit: you know, now that I think about it, Numbers gets ganked exuberant amounts of times regardless of the lane he picks :s
nyan :3 Youtube Channel i sometimes post videos of other games
if you've frozen the lane at your tower, there is no way the jungler can gank you successfully. If your on your half of the lane (and a bit closer to the tower) then you should be fine.
If they've pushed the lane to your tower at the time of a level 2 gank, then they're doing something wrong to begin with.
nyan :3 Youtube Channel i sometimes post videos of other games
Most decent junglers would see what lane is countered the hardest and pick out a jungle path specifically getting them close to the lane for an early level 2/3 gank.