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:
| Perpetrator | Date | Year | Location | Country | Killed | Injured |
| --- | --- | --- | --- | --- | --- | --- |
| Sanurip , 36 | 04.15 April 15 | 1996.0 | Timika Airport | Indonesia | 16.0 | 11 |
| Chelakh, Vladislav , 19 | 05.27 May 27/28 | 2012.0 | Arkankergen frontier post | Kazakhstan | 15.0 | 0 |
| Sherrill, Patrick Henry , 44 | 08.20 Aug. 20 | 1986.0 | Edmond , OK | U.S. | 14.0 | 06 6 |
| Hasan, Nidal Malik , 39 | 11.05 Nov. 5 | 2009.0 | Fort Hood , TX | U.S. | 13.0 | 32 |
| Barton, Mark Orrin , 44 | 07.27 July 27–29 | 1999.0 | Atlanta , GA | U.S. | 12.0 | 13 |
| Alexis, Aaron , 34 | 09.16 Sep. 16 | 2013.0 | Washington, D.C. | U.S. | 12.0 | 3 |
| Lz | 04.32 | 1979.9 | Fz | Tx | 4.9 | 0.9 |
| Leung Ying , 29 | 08.22 Aug. 22 | 1928.0 | Fairfield , CA | U.S. | 11.0 | 04 4 |
| Tazmal Hossein | 12.01 Dec. 1 | 1914.0 | Naihati | India | 10.0 | 11 |
| Kim Won-jo, 25 | 05.01 May 1 | 1974.0 | Kimpo | South Korea | 10.0 | 03 3 |
| Vaganov, Artur , 22 | 06.01 June 1 | 1997.0 | Sida | Abkhazia | 10.0 | 03 3 |
| Sz | 07.32 | 1989.9 | Lz | Lz | 5.9 | 02.9 |
| Lee Wei, 41 | 04.05 April 5 | 1962.0 | Patch | Taiwan | 10.0 | 0.2 0-2+ |
| Ahmed Gul, 46 | 04.27 April 27 | 2011.0 | Kabul | Afghanistan | 9.0 | 01.6 1–6 |
| Smith, William Vincent, 19 | 04.23 April 23 | 1946.0 | LST 172 | U.S. | 9.0 | 01 1 |
| Unknown | 07.29 July 29 | 1982.0 | Maputo | Mozambique | 9.0 | 0.0 ? |
| Moreño, Jonathan, 31 | 01.16 Jan. 16 | 2005.0 | Kalibo | Philippines | 8.0 | 29–33 |
Question:
What is the average Year, when Country is "U.S.", and when Location is "Edmond , OK"?
Answer:
1986.0