FInding whats not there

I tried asking this question a few weeks ago, and because of my own stupidity, was chastised by Joe Celko (deservedly) but when I finally did give a better explanation of the problem. The scenario is a group of cyclists that log their miles as they are completed. The logs are inserted to a mileagelog table:

Create table #mileagelog
(
    ride_id int ---PK
,  rider_id int --fK
,  ride_date DATETIME
 , distance_miles int
 , ride_time  int   (in minutes)
, century int --[1 century = 100  miles in bicycle slang. If the individual ride is 100 or more miles this is 1 if less then 0]
);

Data:

INSERT  INTO #mileagelog VALUES
(303,23,'2001-01-01 00:00:00.000',  60, 217,    0),
(304,23,'2001-01-02 00:00:00.000',   7, 24,     0),
(305,24,'2001-01-01 00:00:00.000',  25, 120,	0),
(306,18,'2001-01-04 00:00:00.000', 100,	455,	1),
(307,23,'2001-01-04 00:00:00.000', 100,	385,	1),
(308, 2,'2001-01-06 00:00:00.000', 24,	103,	0),
(309,24,'2001-02-10 00:00:00.000',  101,382,	1),
(310,23,'2001-02-05 00:00:00.000',   9,	 50,	0),
(311,25,'2001-02-06 00:00:00.000', 101,	463,	1),
(312,18,'2001-02-06 00:00:00.000', 100,	509,	1),
(313,24,'2001-02-16 00:00:00.000', 101, 382,	1);

Daily query

SELECT rider_id AS [Rider]
, distance_miles AS [Distance]
, ride_date
, elapsed_time
, century (1 or 0)
This query shows riders daily logs -
(if they rode over 100 miles then century = 1
if less 0)

Monthly query

SELECT riderid,
SUM(distance_miles),
SUM(century) as [centuries],
MONTH(ride_date)
GROUP BY RIDERID, MONTH(ride_date)
ORDER BY riderid, Month(ride_date)

This returns the total miles and centuries from one month.

What I don't know is how to get the yearly total  and whether or not they should or should  not get a 'goldstar'. To  pass they must have at least one century a month for all twelve months completed in each month. They cannot miss a month, and you have to be able to calculate as the year passes, not just at year end.

Hope this is clear enough, feel free to ask...

Thank you, Dave