Here is an example of my calorie usage for today from Fitday.com:

Calories Burned Today
source cals % total
Total: 3532
Basal: 1656 47%
Lifestyle: 1314 37%
Activities: 562 16%

So, if I am eating 1800 calories, I am creating a 1732 calorie deficit, hence my body is burning 1732 of it's own calories. I think you are fine at 2000 calories a day, just stay a couple hundred above your BMR and you should continue to lose weight. That is what I try and do.