If the next census is conducted properly in Macedonia the Albanians will number 440-470000 people and will be 26% of the population which is essentially the same amount of Albanians in the country since 1991/1994 census I.e. they have been at the same approximate number since 25 years ago.
As far as voting approximately 30000 Albanians voted for Macedonian parties.
From independence until today at almost every election around 220-250000 Albanians vote. That has stayed pretty consistent and hasn't changed much.