Halving 2016: bitcoin went up >400% in 12 months
Halving 2012: bitcoin went up 13000% in 6 months
So it's easy to predict bitcoin will go up.
Right you are! That's how a deflationary currency/asset should work. After each halving, bitcoin's block reward decreases by half while the effort remains same. So the price is destined to go up. Just imagine the sitiation below,
Earlier you used to produce 5 loaf of breads by spending 1 dollar to sell it for 5 dollars which essentially means that each bread costs 1 dollar at market. Now due to technical limitations, you can only produce 2.5 loaf of breads by spending 1 dollar. But you need to maintain the profitability so the price of each bread automatically goes up to 2 dollars. It's the same concept!
Bread goes stale after some days, most of the bread demand needs to be fresh baked. Bitcoin doesn't lose value overtime, produced coins can be resold indefinitely. The market is the source of most bitcoins, 18 out of 21 millions are already made, new coins are a minuscule part of the equation, and thanks to halvings they make for less and less which also tends to stabilize the price.
The next 3 million will take a hundred years, and the largest part of those will be minted in the next few years. Indeed bitcoin production quickly loses its weight. Rather than bread bitcoins is like Deloreans (or some other limited production good), most where made in the early 80ies but no one is making them anymore. Take a look at the prices of these and you will notice a curious pattern repeating...
Most people buying bitcoin are going to get them from the market, not fresh, and this number will approach 100% with time in an identical logarithmic pattern.
There are assets like oil where production still weights more, but you have to take a look at other things that are not being made anymore. If we follow OP's reference, the "increase", should be less than 400%. If the first was 13000%, the second was 400%, then the next could be... 50%? Sounds about right.