What is grand total score (sum of all points) for
- users (sum of all reputation points for all users)
- questions (sum of all votes for all questions)
- answers (sum of all votes for all answers)
Is there numbers or plot somewhere?
There are current stats for all stack exchange sites available here: http://stackexchange.com/sites
This doesn't plot the value over time, however choosing "more stats" will show you some trend data.