Mr. Chair, not every asset has a 40-year lifetime, but we do look at what the comparables would be. If we have a similar asset or equipment, we will look at the costs of personnel, training, maintenance over time, and we will project those over a timeframe. These essentially, as you have put them, are estimates of through life cycle, and those estimates get refined annually once the asset is acquired and addressed.
We have found that some assets can go much beyond their original expected life duration, but then the maintenance costs go up significantly. They are adjusted through the life of the asset, but when you are about to make a purchase, it is good practice, which is done in all enterprises when you have significant asset purchases, to look at what your expected costs over the duration of the use of that asset would be. You need that in order to be able to plan, for budgeting and planning purposes.