What amount is suitable for yeast addition?

What amount is suitable for yeast addition?

Normally yeast addition is (1.5-1.8)x10^7 cell/ml wort,
which equals 0.6-0.8L Concentrated yeast mud/hl wort.
The yeast addition should be suitable, not too less and too much.
If yeast quantity is too less, yeast will have a longer breeding time,
which will cause infection and expanding fermentation time.
If yeast quantities is too much, the beer taste will be affected,
like some yeast taste and light taste, too much will cause yeast degeneration and autolysis.
The principal of adding is like below:
A higher wort concentration and lower fermenting temperature require a higher yeast addition.
A yeast concentration higher than (0.8-1.0)x10^7/ml wort is required to ensure wort fermenting well.
Below is the reference for addition according to experience: