http://stasny.us/images/Halving.gif
Here is a table assuming that the coin really is halved every 150K blocks as noted in the survey. Because of the geometric progression of halving, we will never get past 180M coins as it becomes asymptotic at just over 180M coins. We need to think through a model that reduces the supply but does not kill off the reward.   For example, if the block reward is halved twice down to 105, but then stays there, mining can continue to late 2017 before we hit 420M coins.