series number  number of episodes  original air date dvd region 2 release date dvd region 1 release date
0               1                   6               1973          2 september 2002                       tba
1               2                   7               1975          2 september 2002                       tba
2               3                   7               1976              26 july 2004             11 march 2008
3               4                   7               1977              26 july 2004          9 september 2008
4               5                   7               1979              5 march 2007          6 september 2009
5               6                   7               1982              5 march 2007             27 april 2010
6               7                   6               1983              3 march 2008             27 april 2010
7               8                   6               1985              3 march 2008               9 july 2010
8               9                  12               1987                5 may 2008           18 january 2011
9              10                   6               1988         22 september 2008             12 april 2011
10             11                   7               1989         22 september 2008             12 april 2011
11             12                  10               1990          26 december 2008              12 july 2011
12             13                   6               1991          26 december 2008          21 february 2012
13             14                   9               1992           26 october 2009             17 april 2012
14             15                   9               1993           26 october 2009              24 july 2012
15             16                   8               1995          27 december 2010                       tba
16             17                  10               1995          27 december 2010              15 june 2004
17             18                  10               1997           7 february 2011           15 january 2013
18             19                  10               1998           7 february 2011             16 april 2013
19             20                  10               1999             26 march 2012               9 july 2013
20             21                  10               2000             26 march 2012           15 october 2013
21             22                  10               2001             23 april 2012           14 january 2014
22             23                  10               2002             23 april 2012                       tba
23             24                  10               2003                       tba                       tba
24             25                  10               2004                       tba                       tba
25             26                  10               2005                       tba                       tba
26             27                   9               2006                       tba                       tba
27             28                  10               2007                       tba                       tba
28             29                  11               2008                       tba                       tba
29             30                  10               2009                       tba                       tba
30             31                   6               2010                       tba                       tba

Table as JSON:
{"series number":{"0":1,"1":2,"2":3,"3":4,"4":5,"5":6,"6":7,"7":8,"8":9,"9":10,"10":11,"11":12,"12":13,"13":14,"14":15,"15":16,"16":17,"17":18,"18":19,"19":20,"20":21,"21":22,"22":23,"23":24,"24":25,"25":26,"26":27,"27":28,"28":29,"29":30,"30":31},"number of episodes":{"0":6,"1":7,"2":7,"3":7,"4":7,"5":7,"6":6,"7":6,"8":12,"9":6,"10":7,"11":10,"12":6,"13":9,"14":9,"15":8,"16":10,"17":10,"18":10,"19":10,"20":10,"21":10,"22":10,"23":10,"24":10,"25":10,"26":9,"27":10,"28":11,"29":10,"30":6},"original air date":{"0":1973,"1":1975,"2":1976,"3":1977,"4":1979,"5":1982,"6":1983,"7":1985,"8":1987,"9":1988,"10":1989,"11":1990,"12":1991,"13":1992,"14":1993,"15":1995,"16":1995,"17":1997,"18":1998,"19":1999,"20":2000,"21":2001,"22":2002,"23":2003,"24":2004,"25":2005,"26":2006,"27":2007,"28":2008,"29":2009,"30":2010},"dvd region 2 release date":{"0":"2 september 2002","1":"2 september 2002","2":"26 july 2004","3":"26 july 2004","4":"5 march 2007","5":"5 march 2007","6":"3 march 2008","7":"3 march 2008","8":"5 may 2008","9":"22 september 2008","10":"22 september 2008","11":"26 december 2008","12":"26 december 2008","13":"26 october 2009","14":"26 october 2009","15":"27 december 2010","16":"27 december 2010","17":"7 february 2011","18":"7 february 2011","19":"26 march 2012","20":"26 march 2012","21":"23 april 2012","22":"23 april 2012","23":"tba","24":"tba","25":"tba","26":"tba","27":"tba","28":"tba","29":"tba","30":"tba"},"dvd region 1 release date":{"0":"tba","1":"tba","2":"11 march 2008","3":"9 september 2008","4":"6 september 2009","5":"27 april 2010","6":"27 april 2010","7":"9 july 2010","8":"18 january 2011","9":"12 april 2011","10":"12 april 2011","11":"12 july 2011","12":"21 february 2012","13":"17 april 2012","14":"24 july 2012","15":"tba","16":"15 june 2004","17":"15 january 2013","18":"16 april 2013","19":"9 july 2013","20":"15 october 2013","21":"14 january 2014","22":"tba","23":"tba","24":"tba","25":"tba","26":"tba","27":"tba","28":"tba","29":"tba","30":"tba"}}