Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| # | Volume line | Volume title | Creators | Material collected | Publication date | ISBN |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Superman | Kryptonite Nevermore | Dennis O'Neil Curt Swan | Superman #233-238, #240-242 | 2009/01/28 | 978-1401220853 |
| 2.0 | Legion of Super-Heroes | The Life and Death of Ferro Lad | Jim Shooter Curt Swan, et al. | Adventure Comics #346-347, #352-353, #357 | 2009/02/18 | 978-1401221935 |
| 3.0 | Batman | The Annuals, Vol. 1 | Bill Finger Edmond Hamilton Dick Sprang , et al. | Batman Annual #1-3 | 2009/04/22 | 978-1401221928 |
| 4.0 | Swamp Thing | Roots of the Swamp Thing | Len Wein Berni Wrightson | House of Secrets #92 Swamp Thing #1-13 | 2009/05/27 | 978-1401222369 |
| 5.0 | The Flash | Flash of Two Worlds | Gardner Fox Carmine Infantino John Broome | The Flash #123, #129, #137, #151, #170, #173 | 2009/07/29 | 978-1401222987 |
| 6.0 | Justice League of America | Justice League of America by George Pérez, Vol. 1 | Gerry Conway George Pérez | Justice League of America #184-186, #192-194 | 2009/08/26 | 978-1401223212 |
| 7.0 | Batman | A Death in the Family | Jim Starlin Marv Wolfman George Pérez, et al. | Batman #426-429, #440-442 The New Titans #60-61 | 2009/09/23 | 978-1401225162 |
| 8.0 | Justice League of America | Justice League of America by George Pérez, Vol. 2 | Gerry Conway George Pérez, et al. | Justice League of America #193-197, #200 | 2010/04/13 | 978-1401224509 |
| 9.0 | Batman | The Annuals, Vol. 2 | Bill Finger | Batman Annual #4-7 | 2010/08/10 | 978-1401227913 |
Question:
Name the total number of material collected for  justice league of america by george pérez, vol. 2
Answer:
1.0