![Ugly graph](https://i.stack.imgur.com/UfMas.jpg)

Shown here is a graph that displays statistics on car sales trends. While the information is there, its not exactly readable and I would say an eye-sore, you have to peer in and start matching colours and signs to understand whats going on in the image. 

What would be the best way to display this data beautifully and make it easy to understand?.