It is obvious in the graphic/table that the rate/number/amount of Y has undergone dramatic changes. It has gone up/grown/fallen/dropped considerably in recent years . At the point of X1, Y reaches its peak value of .

　　What is the reason for this change? Mainly there are reasons behind the situation reflected in the graphic/table. First of all, . More importantly, . Most important of all, .

　　From the above discussions, we have enough reason to predict what will happen in the near future. The trend described in the graphic/table will continue for quite a long time .