I did not see this. There is no evidence of massive variability of population demographics in guyana. If I see such I would worry as to data collecting error rather than an existing fact.
Cultural self identification is also very stable. They young may inter marry but their self concept is not mutable. It has to be stable for personal identity and a sense of being in the world.
Indians will always self identify and adopting the mores of others or even specific cultural drift does not abrade such self identification.
The records for the last election indicate very few failing to list an ethnic designation or to be not sure. The listing of mixed may be an imprecise category as to where on the ethnic divide these people self identity but there is no category in the nation that lists creole as a self concept. Most mixed people will self identify as black if given the choice between "Indian" or "black" if that is their gene pool.
Creole is a cultural concept, not a form of ethnic affiliation. In Guyana ethnic indentity doesnt always conform to the cultural continuum that a person might exhibit. Those days are over, and there is much more cultural blending, even as our ethnic paranoias remain as strong as ever.
What we know is that the Indian population is dwindling, most likely due to high rates of emigration....49% in 1991 to 43% in 2002. The African population dwindled more slowly from 32% to 30%, assumptions being lower rates of emigration (the African extended family being weaker and therefore offering a narrower range of emigration options).
The big transformation has been the rapid growth of the SELF IDENTIFIED mixed population, and to a lesser degree the Amerindian. The latter having the highest birth rates among the ethnic groups, and also participating the least in permanent emigration to North America, and the Caribbean.
The mixed population grew from 12% in 1991 (under PNC rule) to 17% in 2012 (under PPP rule). This may indeed reflect a sharp increase in miscegenation among Indians/Africans/Amerindians, and the remnants of the Portuguese and Chinese populations.
It might reflect people, who under PNC rule self identified as "Black", but now select "Mixed," now that "black out of style" with Indians assuming political and even fuller economic dominance, this reducing the social prestige of being "black".
The fact is that we dont know. And this has political repercussions. If the rapid growth of the mixed population since 1991 is due to increased miscegenation, then this mixed population is different from the traditional "mulatto" population, who were culturally merely light skinned blacks, and therefore indistinguishable in terms of their ethno political behavior.
What we do know is that most of these people are below voting age, and therefore people mustnt get too excited by this group.
If the mixed population is growing to a degree because some, who in previous census self identified as black, but now prefer to be mixed, then these people will remain an integral part of the Afro Guyanese population.
Of course a growing % of this mixed population likely include Brazilians who are now (semi) permanent residents of Guyana. Do they wish to meddle in Guyanese politics, or do they see it as too messy, and so wish no part of it?
Regardless Guyana is moving away from its traditional mode where ethnic affiliations, and cultural identity were closely related, and the mixed were a mere residual (light skinned black) population.