There's no corporate report on annual gains with BTC, so it does not rise and fall in the same way.
You are right. But in general, the rule of supply and demand is what drives prices up or down when it comes to basically everything!
Look at what happened to the prices of certain Graphics Cards due to mining for example; Cards that previously sold at almost half the price! The cost of production didn't change (in fact, it dropped due to the increase in production numbers), the number of retailers didn't change (basically), nor did the specification of the cards changed.
Report or no report, prices are driven up or down based on the value that people place on an item / commodity / currency by their demand.