Public cloud services market forecast from Gartner

The public cloud services market is forecast to grow 17.3 percent to $206.2 billion in 2019 from $175.8 billion in 2018 and $145.3 billion in 2017, according to Gartner.
Public Cloud services forecast from GartnerCloud system infrastructure services (infrastructure as a service or IaaS) is forecast to grow 27.6 percent to $39.5 billion in 2019 from $31 billion in 2018.

90 percent of organizations will be purchasing public cloud IaaS from an integrated IaaS and platform as a service (PaaS) provider, and will use both the IaaS and PaaS capabilities from that provider by 2022.

Software as a service (SaaS) revenue is expected to grow 17.8 percent to $85.1 billion in 2019.

Business process as a service (BPaaS) revenue will grow at 7.9 percent to $50.3 billion in 2019.