[{{{ wiki_statistics_URL }}} Statistics]
Wiki Size: [[:Category:{{ {{{wiki_size}}} }}|{{{wiki_size}}}]]

boilerplate (new style)

{{Size
| wiki_statistics_URL =  No 
| wiki_pages = number of pages
}}

boilerplate (old style)

don't use this style ano more, use the new style instead

{{Size
| wiki_statistics_URL =  No 
| wiki_size = Size category
}}