Actually considering its very special and unique status, UK isn't a donor but a parasite (with your categories).
Here is the net contribution to the EU budget in 2015:
As you can see, the United Kingdom is the second largest net donor, after Germany. And surprisingly Netherlands is at #3 (I was expecting France or Italy).
This doesn't mean anything
How much do they get back? What is the percentage of it considering being a small/big country?
If Germany and Austria are donating the most money, how is the "4th Reich" useful for them?
It's just draining € from them, by your logic
Remember what happened in the 1930s. The third Reich had also employed similar tactics. Right now, Germany is in short supply of slave labor. The European Union provides them cheap labor from countries such as Greece, Romania, Poland, and Bulgaria. What happened to the Greeks (debt bondage) will happen to the others in the EU as well. They can work for the German masters, until they payoff their never-ending debts.
Which tactics are those?
Except for Germany having a debt of 2.2 trillion €
You could wrap $1 bills around the Earth 9,122 times with the debt amount
If you lay $1 bills on top of each other they would make a pile 255,922 km
That's equivalent to 0.67 trips to the Moon
You're a ruskie, you don't want a strong union of countries on the west, it's cool, we get it