| # | Tier | Division | G | W | D | L | GF | GA | Pts | +- | ||
| 1979-80 | English Isthmian Premier | 42 | 17 | 13 | 12 | 72 | 53 | 64 | 19 | |||
| 1980-81 | English Isthmian Premier | 42 | 22 | 9 | 11 | 76 | 49 | 75 | 27 | |||
| 1981-82 | English Isthmian Premier | 42 | 21 | 10 | 11 | 63 | 48 | 73 | 15 | |||
| 1982-83 | English Isthmian Premier | 42 | 26 | 7 | 9 | 79 | 47 | 85 | 32 | |||
| 1983-84 | English Isthmian Premier | 42 | 16 | 14 | 12 | 63 | 52 | 62 | 11 | |||
| 1984-85 | English Isthmian Premier | 42 | 24 | 6 | 12 | 68 | 46 | 78 | 22 | Promoted | ||
| 1985-86 | English National League | 42 | 10 | 13 | 19 | 55 | 84 | 36 | -29 | Relegated | ||
| 1986-87 | English Isthmian Premier | 42 | 32 | 5 | 5 | 103 | 32 | 101 | 71 | Promoted | ||
| 1987-88 | English National League | 42 | 11 | 13 | 18 | 50 | 76 | 46 | -26 | |||
| 1988-89 | English National League | 40 | 20 | 11 | 9 | 68 | 52 | 71 | 16 | |||
| 1989-90 | English National League | 42 | 17 | 10 | 15 | 64 | 56 | 61 | 8 | |||
| 1990-91 | English National League | 42 | 21 | 11 | 10 | 75 | 46 | 74 | 29 | |||
| 1991-92 | English National League | 42 | 30 | 4 | 8 | 49 | 13 | 94 | 36 | |||
| 1992-93 | English National League | 42 | 24 | 11 | 7 | 84 | 37 | 83 | 47 | Promoted | ||
| 1993-94 | English League Two | 42 | 19 | 13 | 10 | 67 | 53 | 70 | 14 | Promoted | ||
| 1994-95 | English League One | 46 | 21 | 15 | 10 | 60 | 46 | 78 | 14 | |||
| 1995-96 | English League One | 46 | 15 | 15 | 16 | 63 | 59 | 60 | 4 | |||
| 1996-97 | English League One | 46 | 15 | 10 | 21 | 51 | 56 | 55 | -5 | |||
| 1997-98 | English League One | 46 | 14 | 18 | 14 | 51 | 53 | 60 | -2 | |||
| 1998-99 | English League One | 46 | 13 | 12 | 21 | 52 | 58 | 51 | -6 | |||
| 1999-00 | English League One | 46 | 16 | 13 | 17 | 56 | 53 | 61 | 3 | |||
| 2000-01 | English League One | 46 | 15 | 14 | 17 | 46 | 53 | 59 | -7 | |||
| 2001-02 | English League One | 46 | 17 | 13 | 16 | 58 | 64 | 64 | -6 | |||
| 2002-03 | English League One | 46 | 13 | 13 | 20 | 59 | 66 | 52 | -7 | |||
| 2003-04 | English League One | 46 | 6 | 19 | 21 | 50 | 75 | 37 | -25 | Relegated | ||
| 2004-05 | English League Two | 46 | 17 | 14 | 15 | 58 | 52 | 65 | 6 | |||
| 2005-06 | English League Two | 46 | 18 | 17 | 11 | 72 | 56 | 71 | 16 | |||
| 2006-07 | English League Two | 46 | 16 | 14 | 16 | 52 | 47 | 62 | 5 | |||
| 2007-08 | English League Two | 46 | 22 | 12 | 12 | 56 | 42 | 78 | 14 | |||
| 2008-09 | English League Two | 46 | 20 | 18 | 8 | 54 | 33 | 78 | 21 | Promoted | ||
| 2009-10 | English League One | 46 | 10 | 15 | 21 | 56 | 76 | 45 | -20 | Relegated | ||
| 2010-11 | English League Two | 46 | 22 | 14 | 10 | 69 | 50 | 80 | 19 | Promoted | ||
| 2011-12 | English League One | 46 | 11 | 10 | 25 | 65 | 88 | 43 | -23 | Relegated | ||
| 2012-13 | English League Two | 46 | 17 | 9 | 20 | 50 | 60 | 60 | -10 | |||
| 2013-14 | English League Two | 46 | 12 | 14 | 20 | 46 | 54 | 50 | -8 | |||
| 2014-15 | English League Two | 46 | 23 | 15 | 8 | 67 | 45 | 84 | 22 | |||
| 2015-16 | English League Two | 46 | 17 | 13 | 16 | 45 | 44 | 64 | 1 | |||
| 2016-17 | English League Two | 46 | 19 | 12 | 15 | 58 | 53 | 69 | 5 | |||
| 2017-18 | English League Two | 46 | 24 | 12 | 10 | 79 | 60 | 84 | 19 | Promoted | ||
| 2018-19 | English League One | 46 | 14 | 11 | 21 | 55 | 67 | 53 | -12 | |||
| 2019-20 | English League One | 34 | 17 | 8 | 9 | 45 | 40 | 59 | 5 | Promoted | ||
| 2020-21 | English Championship | 46 | 11 | 10 | 25 | 39 | 69 | 43 | -30 | Relegated | ||
| 2021-22 | English League One | 46 | 23 | 14 | 9 | 75 | 51 | 83 | 24 | |||
| 2022-23 | English League One | 46 | 20 | 9 | 17 | 59 | 51 | 69 | 8 |