I just take a good look at korean's won economy. In 2009, they made 1,600 won per one US dollar. Which back in ogp, we had great update. Today, they made 1,113 won per US dollar. Now we got trashed update cuz da boxes. RIP Rumble FIghter.
Here for your graph math lesson :> On the left side is the income nor the money. On the below is the years. On the very below is the "stretch" length On the line where it telling how much is it worth go up or down. On the right is time line. Hope this help you understand.