This inclusion rate increased to 66.67% in 1988 and to 75% in 1990. This lasted about a decade and in February 2000, the rate was reduced down to two thirds, which lasted until October 2000, where it was dropped back to 50%, where it has remained to this day.
1988 Mulroney increased
1990 Mulroney increased
2000 Chretien reduced and reduced.
Notice anything?
Y2K?