How large in GB is your PIWIK Install? / RFP

Hello,

Looking to the community to answer a space planning question I haven’t found a answer for.
Want to host PIWIK on a virtual server, and unsure about what to budget for.

Could members please reply with

A. Average number of Hits Per Month or Per Year (ie 50,000 a month)
B. Total disk space of the Server / Growth rate of file size (5 gb Instance Grows 500 Mb./ month)
C. How many years you keep ?