Wow, that really puts it into perspective. From my understanding, 1 ml equates to about 20 drops. I don't know how many mils I am going through because I vary from bottle to bottle but if I had to put a count on the amount of times I drip during the day, assuming that each dripping session is 3 drops, I am dripping about 30 times a day. So I must be going through 5 mls a day!
I'm giving that number based on a 30 ml bottle lasting about two weeks. That's really all I use to keep track.