[Plugin: UPM Polls] Get result previous poll

This plugin is great, and I’m currently putting it in my website. I have to following question: How can I call the result of the previous poll.

For example, I want to display this:
Previous week people voted for: %%result_previous_poll%%

Hoping for help!

http://ww.wp.xz.cn/extend/plugins/upm-polls/