So in 2006 the PPP won 54% of the vote with 186k votes. In 2011 they won 49% of the votes with 168k votes. The PNC in 2006 won 34% of the votes with 115k votes. In 2011 they won 41% of the votes with 139k votes.
Don't know the point that you make, but given generational and demographic changes, if we look at the last two elections, the trends aren't good for the PPP. Its Indian voting base is declining and it has COMPLETELY failed to penetrate the African/mixed voting base of the opposition.
Note that it is the mixed population which grows with every election, and its clear that their preference is for APNU or the AFC.
Or it could be that the Corrupt PPP/C supporter has not been going out and vote, if the same trend continues.......then we will definately see the corrupt ppp/c kicking dust.