Vlookup(sandwich)

Whilst chewing my way through my sandwiches I have been trying to find a better way of identifying the walkers completing their first full lap and those doing so on their debut.

I've almost cracked it but I return to one of the old problems in that some of the people who show up as first time finishers probably covered part in an earlier year (because I don't have a record of the non finishers from 1960 to 1973).

I know that John Cannell first entered in 1962, for example, but for consistency I will leave him until I can be sure about the others in red:

Albert Johnson	1967	15:54:51
Richard Brown	1998	15:59:44
Leece Kneale	1968	16:05:52
Sandra Brown	1998	16:16:36
Arie Boertjes	1998	16:26:22
Brian Ashwell	1995	16:37:47
John Dowling	1974	16:40:07
Kevin Marshall	2004	16:55:07
Charlie Weston	1985	16:57:47
Joe Brown	1963	17:04:09
Ian Hodkinson	1969	17:11:25
Willie Kneale	1963	17:20:31
Dudley Seddon	1970	17:21:49
Martijn Biesmans	2007	17:29:41
Christopher Flint	1997	17:36:40
John Cannell	1967	17:42:36
Stan Sille	1970	17:45:35
Geoff Dowling	1978	17:50:28
Edmund Shillabeer	2009	17:51:08
Ann Sayer	1978	17:51:17
Gordon Vale	1990	17:55:10
Cyril Evans	1969	17:58:07
Boyd Millen	1997	18:00:36
Karen Marie Brogger	1998	18:05:12
Marleen Radder	1998	18:05:23
Paul Briggs	1979	18:07:06
Neill Skillen	2010	18:08:52
Ray Manning	1971	18:10:00
Charles-Tunde Arosanyin	2001	18:10:35
Frank Dolan	1981	18:25:02

A good many of the people finishing at the first attempt are from the UK.