year 1st venue 2nd venue 3rd venue 4th venue 5th venue 6th venue
year
1st venue
2nd venue
3rd venue
4th venue
5th venue
6th venue
number
number text text text text text text
2007 sheffield mexico city nanjing tijuana guadalajara guadalajara
how long , in years , has the this world series been occurring ?
WRB RB , IN NNS , VBD-AUX DT DT NNP NNP VBD-AUX VBG .
7 years
select max ( c1_number ) - min ( c1_number ) from w