I don't have statistics at my fingertips. I could probably find some and provide them.
Here are a couple of things about Nord Stream 2. It doesn't exist yet, which means Russia is doing a fine job of supplying energy to Europe without it. It's part of Russia's plan for long-term energy supply to Europe. That's why it's important, but not starting it doesn't actually change anything. It preserves the status quo.
The other thing that's really important to remember is that when Nord Stream 2 was first thought up, the idea was that it was a way to avoid transit through Ukraine, so that German energy supplies would be protected from fights between Russia and Ukraine. The fact is, at this point most of Germany's energy from Russia does not transit through Ukraine. Over the time that Nord Stream 2 was in the works, lots of other routes have developed. For Germany, at least, that's not an issue. It's more of an issue for some other countries.
It's really become much more of a political issue than not. That isn't to say it's meaningless for Russia; it's quite important for Russia and Germany. There are sunk costs. People have put a lot of money into this pipeline. For Russia, it is a big part of their model for how to supply Europe, but it has also become, I would say, more politically important than it is economically important.