Also...didn't the hash marks change at some point in the last 30 years...or am I imagining that?
I checked that yesterday. Hash marks were moved in in 1972, so it hasn't been a difference maker in the 90s and 00s. The change came much before.
HISTORY OF KICKING RULES1904 Field goal value was changed from five points to four
1909 Field goal value was changed from four points to three
1933 Goal posts were moved from the end lines to the goal lines, and inbounds lines or hashmarks where the ball
would be put in play were placed 10 yards from the sidelines
1935 Hashmarks were moved nearer the center of the field, 15 yards from the sidelines
1945 Hashmarks were moved from 15 yards away from the sidelines to nearer the center of the field, 20 yards from
the sidelines.
1960-1969 AFL included the option of the two-point conversion after touchdowns
1966 Goal posts offset from the goal line, painted bright yellow, and with uprights 20 feet above the cross-bar were
made standard in the NFL.
1967 "sling-shot" goal posts (with one curved support from the ground) were made standard in the NFL
1972 Hashmarks were moved nearer the center of the field, 23 yards, 1 foot, 9 inches from the sidelines… the
hashmarks were now 18 feet, 6 inches apart (the same width as the goalposts), cutting down on severe
angles for short field goal attempts
1974 The goal posts were moved from the goal line to the end lines and the uprights would be extended to 30 feet
above the crossbar; kickoffs were moved from the 40 back to the 35-yard line; and after missed field goals
from beyond the 20, the ball was to be returned to the line of scrimmage
1979 Prohibited players on the receiving team from blocking below the waist during kickoffs, punts, and field-goal
attempts
1994 Added the option of the two-point conversion after touchdowns; the starting point of all kickoffs were moved
back from the 35 to the 30-yard line; kickoff tees used can be no more than one inch in height (previously 3
inches); all field goals attempted and missed when the spot of the kick is beyond the 20 yard line, the
defensive team taking possession will get the ball at the spot of the kick; on any field goal attempted and
missed with the spot of the kick is on or inside the 20, the ball will go to the defensive team taking possession
at the 20; and the 11 players on the receiving team are prohibited from blocking below the waste during a play
in which there is a kickoff, safety kick, punt, field goal attempt or extra point kick with one exception,
immediately at the snap on these plays those defenders on the line of scrimmage lined up on or inside the
normal tight end position can block low
1999 K-ball implemented for all kicking plays in a game
2002 The chop-block technique is illegal on kicking plays; and after a kickoff, the game clock will start when the ball
is touched legally in the field of play (previously, the clock started immediately when the ball was kicked)
2003 If an onside kick inside the final five minutes of the game does not go 10 yards, goes out of bounds, or is
touched illegally, the receiving team will have the option of accepting the penalty and getting the ball
immediately (previously, the kicking team was penalized, but had another chance to kick again from five yards
back)
2004 A punt or missed field goal that is untouched by the receiving team is immediately dead once it touches either
the end zone or any member of the kicking team in the end zone (previously, a punt or missed field goal that
lands in the end zone before being controlled by the kicking team could be picked up by a member of the
receiving team and immediately run the other way)
2005 Unnecessary roughness will be called for blocks away from the play on punters or kickers; during field goal
and extra point attempts, the defensive team will be penalized for unsportsmanlike conduct if it calls
consecutive timeouts in an attempt to "ice" the kicker (previously, the second timeout request was only denied
by officials, and thus could be used to distract the kickers); if the kicking team commits a penalty, the
receiving team can have the option of adding five yards to the return or taking a penalty and forcing the
kicking team to re-kick the ball
2006 Defensive players cannot line up directly over the long snapper during field goal and extra point attempts
2007 Modified the K-ball usage in a game… see separate section regarding the K-ball
2008 Field goal attempts that bounce off the goal post are now reviewable under instant replay (courtesy of the
previous season’s game tying FG by Phil Dawson for Cleveland against Baltimore)
LINK?