Let's look at some data, comparing EU countries, their GDP and their Model S sales:
Country | Norway | Netherlands | Germany | Switzerland | Belgium | Denmark | Austria | France | Sweden |
Model S sold | 4584 | 1521 | 548 | 362 | 339 | 238 | 105 | 95 | 95 |
GDP Billion USD | 516 | 801 | 3590 | 646 | 507 | 324 | 418 | 2739 | 552 |
cars per $B GDP | 8.88 | 1.90 | 0.15 | 0.56 | 0.67 | 0.73 | 0.25 | 0.03 | 0.17 |
I think that's a reasonable stab at comparing - sales in Europe started at about the same time.
Tesla sales in China or the US are much harder to compare since they have been around much longer / shorter.
Just for kicks, let's look just as Q1 sales (which is what I have data for)
| USA | Norway | Netherlands | Germany | Switzerland | Belgium | Denmark | Austria | France | Sweden |
Q1 | 3300 | 2056 | 207 | 239 | 133 | 136 | 111 | 39 | 58 | 34 |
cars per $B GDP | 0.20 | 3.98 | 0.26 | 0.07 | 0.21 | 0.27 | 0.34 | 0.09 | 0.02 | 0.06 |
That's maybe somewhat comparable, but I'd have more caveats here - sales are somewhat established in all markets listed, the pipeline has started to fill (yes, Q2 might look better for Europe, so I'll be happy to update this in a month), but overall the expectation would be that the delivery / demand ratio is reasonably comparable.
What stands out? Well, Norway clearly is an absolute outlier. The rest seems to be at about a 0.2 cars/$B GDP - Germany is a third of that.
So this uses available data - I'm sure that there are several grounds on which one could challenge the logic, but given the Belgium, Denmark and Switzerland (with no EV incentives) are trending ahead of the US, I'd say that Germany being quite a bit behind is significant.