[Plugin: Google Analyticator] Question regarding multisite use

I’m using the multisite feature of WP 3.3.2 to handle different regional sites coming off the base domain as thus:

Site 1: http://www.[domainname].com
Site 2: http://www.[domainname].com/region1
Site 3: http://www.[domainname].com/region2

…and so on. I’ve activated Google Analyticator via network activate. My question is, do I need to then enable the plugin for EACH site or just for the site with the base domain? In Google Analytics I’ve just got the base domain registered.

http://ww.wp.xz.cn/extend/plugins/google-analyticator/