PAP vote results, time line.

1955: won 3 of 25 elected seats,NA %. The PAP began as an opposition party with Lee Kuan Yew as opposition leader. The Labour Front won 13 seats and was the governing party.
1959: won 43 of 51 seats, with 53% of the vote (since 1959, voting in Singapore has been compulsory).
1963, Feb: Operation Cold Store
1963, Sep: won 37 of 51 seats, with 47% of the vote (opposition votes were spilt between the Barisan Sosialis Party and the United People's Party).
Started mobilizing Internal Security Department.
1968: won all of the seats, with 84% of the vote.
1972: won all of the seats, with 69% of the vote.
1976: won all of the seats, with 72% of the vote.
1980: won all of the seats, with 77% of the vote.
1984: won all except 2 seats, with 65% of the vote.
1988: Introduced GRC
1988: won 80 of 81 seats, with 63% of the vote.
1991: won 36 of 40 contested seats, with 61% of the vote.
1991-1997: HDB upgrade?
1997: won 34 of 36 contested seats, with 65% of the vote.
2001: won 27 of 29 contested seats, with 75% of the vote.
2006: won 45 of 47 contested seats, with 66.6% of the vote.