Note that the drone on the D string is pretty much constant throughout. There is also the occasional emphasis of C notes by adding an open A to the drone.
INTRO G |-7-9-9-10-10-12-5--|-----------------|-7-9-9-10-10-12-5--|-----------------| D |-0-0-0-0--0--0--0--|-----------------|-0-0-0-0--0--0--0--|-----------------| A |-------------------|-----------------|-------------------|-----------------| E |-------------------|-----------------|-------------------|-----------------| G |-7-10-10-9-9-7-----|-----------------|-7-10-10-9-9-7-----|-----------------| D |-0-0--0--0-0-0-----|-----------------|-0-0--0--0-0-0-----|-----------------| A |-------------------|-----------------|-------------------|-----------------| E |-------------------|-----------------|-------------------|-----------------| G |-7-9-9-10-10-12-5--|-----------------|-7-9-9-10-10-12-5--|-----------------| D |-0-0-0-0--0--0--0--|-----------------|-0-0-0-0--0--0--0--|-----------------| A |-------------------|-----------------|-------------------|-----------------| E |-------------------|-----------------|-------------------|-----------------| G |-7-10-10-9-9-7---7-|-7-7---7-7--|-7-10-10-9-9-7---7-|-7-7---7-15---15-15-15-| D |-------------------|------------|-------------------|-----------------------| A |-------------------|------------|-------------------|-----------------------| E |-------------------|------------|-------------------|-----------------------| VERSE G |-10--10-9-9-7--7-7-|-7-7-7-7---7-7-7-|-10--10-9-9-7--7-7-|-7-7-7-7---7-7-7-| D |-0---0--0-0-0--0-0-|-0-0-0-0---0-0-0-|-0---0--0-0-0--0-0-|-0-0-0-0---0-0-0-| A |-------------------|-----------------|-------------------|-----------------| E |-------------------|-----------------|-------------------|-----------------|