I think the cleanest acid test is actually going to the Treasury Board Secretariat's departmental plan for this year, where they indicate that the target for the coming year is that 100% of items from the budget will be tabled in the most immediate supplementary estimates. That's the official target from the government, the 100%, and we're currently at roughly 40% for the current year.
On June 20th, 2017. See this statement in context.