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:Issue | Issue Date(s) | Weeks on Top | Song | Artist |
| --- | --- | --- | --- | --- |
| 34:6-8 | 20 December 1980 – 31 January 1981 | 7.0 | " (Just Like) Starting Over " | John Lennon |
| 34:9-12 | 7-28 February | 4.0 | " The Tide Is High " | Blondie |
| 34:13 | 7 March | 1.0 | " The Best of Times " | Styx |
| 34:14-15 | 14-21 March | 2.0 | " Woman " | John Lennon |
| 34:16-18 | 28 March - 11 April | 3.0 | " Celebration " | Kool & the Gang |
| 34:19-20 | 18-25 April | 2.0 | " 9 to 5 " | Dolly Parton |
| 34:21-22 | 2-9 May | 2.0 | " Morning Train " | Sheena Easton |
| 34:23-25 | 16-30 May | 3.0 | " Angel of the Morning " | Juice Newton |
| 34:26-35:4 | 6 June - 22 August | 12.0 | " Stars on 45 Medley " | Stars on 45 |
| 35:5 § | 29 August | 1.0 | " Gemini Dream " | Moody Blues |
| 35:6 | 5 September | 1.0 | " Sausalito Summernight " | Diesel |
| 35:7-8 | 12-19 September | 2.0 | " Urgent " | Foreigner |
| 35:9-14 | 26 September - 31 October | 6.0 | " Endless Love " | Diana Ross and Lionel Richie |
| 35:15 | 7 November | 1.0 | " Every Little Thing She Does Is Magic " | The Police |
| 35:16-20 | 14 November - 12 December | 5.0 | " The Friends of Mr. Cairo " | Jon & Vangelis |
| 35:21-24 | 19 December - 23 January 1982 | 6.0 | " Physical " | Olivia Newton-John |
Question:
What is the sum of Weeks on Top for the Volume:Issue 34:9-12?
Answer:
4.0