See, Cantando, you got it completely the wrong way round.
Tell me one thing in reality that has existed without your consciousness.
You can't. If you can name such a thing, it is already within your consciousness.
There is therefore absolutely no evidence that anything can exist without your consciousness.
Whereas EVERYTHING that you have ever known to exist in reality, has existed in your consciousness. But of course. The fact that you
know it to exist means that you have a certain state of
knowledge.
And what knowledge can you ever have, without consciousness?