Google this question and Dr. Google will tell you that on average a human being breathes about 12-20 times per minute.
Those are average numbers. For a person who practices yoga regularly, those numbers can be much lower.
For example, right now, as I am writing this, I am completely relaxed and meditative. I am breathing about 4-6 times per minute.
Breath, mind and body are connected in a much deeper level than you know of right now. The frequency of your breathing can tell you a lot about your overall physical and emotional health. When you are thought-free, you breathe less. When you are stressed you tend to breathe more. And when you are relaxed, you breathe much slower.
What it means is that if we consciously control the frequency of our breathing, we can control our thoughts and emotions. In yoga, pranayama is one of the key practice among others like asanas, chanting, and meditation. Pranayama is all about controlling your breathe.
Breathing is a phenomenal process. So be conscious of it all the time. Not just thoughts and emotions, you can control the whole world with your breathing. It sounds exaggerated but it is true.