Obviously in 2008 it was 538 (to win an Olympic gold) and most of my scores have been over that this year.
Schoolchildren and older people like the idea of planting trees. For children, it's interesting that an acorn will grow into an oak, and for older people it's a legacy. And the act of planting a tree is not that difficult.
I get even more nervous singing when everyone's fallen silent, but I really try to communicate the meaning of the lyrics, and there's people there listening to that, and if they're moved by it, then I'm moved as well.