I must really be a dumb-dumb and could really use some clarification. From the vintage-trek site, I see the following ranges of serial numbers for various year models (I'm using commas for separators and clarification only):

1980 1 - 1,130
1981 1,131 - 10,265?
1982 10,266? - 42,924
1983 42,925 - 113,648
1984 113,649 - 167,778
1985 167,779 - 224,106
1986 224,107 - 270,975

What are the question marks for the 1981 and 1982 year models? And how does 86,383 fall in the 1981 range? Looks to me like it falls in the 1983 range??? Please help!