The strumming pattern does not stay the same the whole time, it changes sometimes. 
Listen to the song and you can figure it out.

I eared it out, may not be correct, but it sounds like it.


e|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|---7---7---8---8---5-5-7-7-5-7-7-7-7---------5-5-7-7-5-7-7-7-----|
D|---10--10--10--10--8-8-8-8-8-8-8-8-8-5-5-7-7-8-8-8-8-8-8-8-8-----|
A|-------------------------------------8-8-8-8---------------------|
E|-----------------------------------------------------------------|