They generally all come in under budget. This is why we are lapsing over $5 billion in spending every year. The consequences of being over budget are not very pleasant, so generally you are at a balance or you're under. I think if you look overall, the lapsed funding is over $5 billion. Most, if not all departments, are coming in under budget every year.
Just to go back to the supplementary estimates, each year governments make a decision on their spending priorities. They reflect those spending priorities in a budget. Our supplementary estimates and our mains are not aligned. Therefore, once the budget is determined as to what the spending priorities are of the government, then those spending priorities are reflected in the supplementary estimates.
It's not necessarily a question of departments making requests on an ongoing basis to supplementary estimates; it's the fact that the government is deciding its spending priorities through a budget, which is reflected in supplementaries.