Agree with umbertob. To not mention the Discovery 5 after a year of sales is very telling. As far as the increase in Range Rover sales I'm somewhat not surprised. Years ago when looking for my 95RRC LWB it became obvious where RR sales were located. That was NJ, FL and TX. Forget looking in CO or most midwestern areas. Now, this may or may not be a factor but who had significant weather related damage in 2017? Well TX and FL. I wonder how many of those sales were replacement buys.
As far as CO, I have yet to see a Discovery 5 on the road, have seen a few Discovery Sports and many LR3/4's.
Of course that raises the spector of what happened to all those flooded cars? In previous disasters many were dried out and shipped up north.