Deforestation in madagascar?

The biggest threat to a rainforest has always been deforestation and over the previous years, the problem has been getting bigger and bigger. In Madagascar, in 1984 we can see a large rainforest and as the years progress, we see the forest getting smaller and smaller. If you zoom in near Toliara and Bezaha you can clearly see how the places where vast rainforests were have been getting smaller. From 1989 to the 1990s we can see a huge chunk of the forest was cut down which leads us to the question of What is the cause for deforestation