Ubuntu Server market share

[abcuser]

Hi,
is there any info about business market share of Ubuntu Server? I am interested into:
1. Ubuntu Server market share inside Linux distributions (business users only)?
2. Ubuntu Server market share inside Linux/Windows market (business users only)?
3. Ubuntu Server market share inside Linux/Unix/Windows market (business users only)?
4. Ubuntu Server market share inside any business operating system - also mainfraimes (business users only)?
Thanks,
Abcusers