From a tool that I use:
< 1,000 - 8%
<5,000 - 5.7%
<10,000 - 4%
<100,000 - 2.4%
100,000+ - 1.7%
Based on analyzing more than 1 million influencer profiles.
Of course, this is just an average, it will most likely be different across niches and geo locations