2% of Hawaii, as a state (8)
I believe the answer is:
fiftieth
I believe this is a double definition.
'2%' is the first definition.
(2 per cent is one fiftieth)
'hawaii as a state' is the second definition.
(Hawaii was the 50th state to join the USA)
'of' is the link.
(Other definitions for fiftieth that I've seen before include "Gold anniversary" , "This anniversary is golden" .)