Why are fossil fuels increasing year by year?

Fossil fuels are not increasing year by year. However, the known reserves of fossil fuels may be increasing, depending on the success of exploration efforts and the rate of depletion of the reserves. Also, reserves are divided into producible and non-producible portions, with the distinction based on what is considered economical to extract given current prices. As the producible portion is used up and as extraction technology improves, the dividing line between producible and non-producible moves and the producible portion may grow.