When will my voice drop?

I'm 15 years old, and I'm just going to be 16 in 4 months. I'm just wondering if anyone could tell me if I'm close to my voice dropping or growing? I'm about 5"3 and have grown probably about half an inch since October 3, 2013. I have a good amount of pubic hair, very dark long and curly. My penis doesn't look like it's really grown much but maybe I just can't tell. My testicles hang low usually and are wrinkled. My voice is high but it's definitely deepened a bit since last year. My legs have small dark hairs on them that you can only see clearly in the sunlight. No armpit hair or facial hair, and I can feel my adams apple but voice just isn't deep yet. Can anyone tell me if I'm pretty close to growing or my voice dropping? Thanks :).