I was wondering whitch Year did The NFL give there teams by week's.

Here's what I found on Wikipedia, Aaron. The NFL has used the Bye week since 1990.

Bye (sports)

A bye is when a player (http://en.wikipedia.org/wiki/Player_%28game%29) or team (http://en.wikipedia.org/wiki/Team) is allowed to advance to the next round (http://en.wikipedia.org/wiki/Round) of a playoff (http://en.wikipedia.org/wiki/Playoff) tournament (http://en.wikipedia.org/wiki/Tournament) without playing. This most commonly occurs if the number of entrants into the competition (http://en.wikipedia.org/wiki/Competition) is not a power of two (i.e. not 4, 8, 16, 32, etc.), thus resulting in an odd (http://en.wikipedia.org/wiki/Even_and_odd_numbers) number (http://en.wikipedia.org/wiki/Number) at some point. In large tournaments, sometimes the best-ranked players or teams get a bye in the first round(s), to reward them with less risk of elimination, as well as on the basis (particularly in seeded (http://en.wikipedia.org/wiki/Single-elimination_tournament#Seeding) tournaments) that they would be most likely to eliminate the worst seeds anyway. Byes can be applied equally to single-person competitions and team sports, and well as to single-game eliminations and best-of series eliminiations.[/B]

In some tournaments, a player can elect to take a half-point bye for one round and not play.
NFL ("][/URL]
Bye week

In the [URL="http://en.wikipedia.org/wiki/NFL), the two division winners from each of the two conferences with the best record are rewarded with a bye in the playoffs. This is sometimes referred to as a bye week, as one round is played per week. This is necessitated by the current 12-team playoff structure. Eight is the next lowest power of 2, so 4 teams must be eliminated in the first week before the 4 first-week winners continue in the playoff tournament with the 4 remaining teams. The NFL is the only one of the "Big Four" North American sports leagues to offer playoff byes. (The NBA (http://en.wikipedia.org/wiki/NBA) and NHL (http://en.wikipedia.org/wiki/NHL) each allow 16 teams in their postseasons, while MLB (http://en.wikipedia.org/wiki/MLB) allows 8, and since 8 and 16 are both powers of two, no teams receive byes.) The CFL (http://en.wikipedia.org/wiki/CFL) also grants a bye to its two division winners, directly to the division finals as four other teams compete in a semi-final week.
In Canadian (http://en.wikipedia.org/wiki/Canadian_football) and American football (http://en.wikipedia.org/wiki/American_football) in general, the term "bye week" is often erroneously used to refer to any week during the regular season in which a team does not have a game. Each NFL team will have one "bye week" during a normal season, between weeks 3 and 10[1] (http://www.docsports.com/nfl-bye-week.html). Unlike the above traditional usage, there is no advancement or tournament benefit from the missed week. The NFL has used the bye week since 1990 (http://en.wikipedia.org/wiki/1990) so as to extend the regular season schedule to 17 weeks, although between 1999 (http://en.wikipedia.org/wiki/1999) and 2002 (http://en.wikipedia.org/wiki/2002) byes had to be scheduled every week because the league had 31 teams. Traditionally, the CFL and Arena Football (http://en.wikipedia.org/wiki/Arena_Football_League) have scheduled byes only in seasons when they have had an odd number of teams in their leagues, however the CFL has introduced a scheduled bye week for its (currently eight) teams for the 2007 season (http://en.wikipedia.org/wiki/2007_CFL_season).
In leagues such as Australasia's National Rugby League (NRL) where competition points are used to determine standings, the bye also garners points (in the NRL's case, two, equivalent to a win).

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thanks I was not really sure when The Buy week started