AP rates are annual pass rates. This means you bought either a reguar AP or a premium annual pass for a year.
It is good to get one of these if you are planning 2 trips within a year. A lot of people buy these and plan one trip now and one trip the week or two before the passes expire. The break even point on the passes is 8 or 9 days sooner if you can get the great rates on rooms but they don't always have them.