how unique should the content be?

i found this thise on the net: utext.rikuz.com/en/

it seems like a very useful tool however i don't know what numbers i should aim for to spin "unique content"

for an articel of 1000 words this are my results:

Number of words in the shingle - 1. Similarity - 28.64%
Number of words in the shingle - 2. Similarity - 8.21%
Number of words in the shingle - 3. Similarity - 2.78%
Number of words in the shingle - 4. Similarity - 1.12%

so is this good? any procentages to aim for?

thanks and sorry for the bad english

You should aim for at least 30% uniqueness.

Yes, 30% is enough.