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 |
| --- | --- | --- | --- | --- | --- | --- |
| Woo Bum-Kon , 27 | 04.26 April 26/27 | 1982.0 | Uiryeong | South Korea | 56.0 | 34–37 |
| Feng Wanhai, 26 Jiang Liming, 22 | 11.18 Nov. 18 | 1995.0 | Zhaodong | China | 32.0 | 16 |
| Toi, Mutsuo , 21 | 05.21 May 21 | 1938.0 | Kaio | Japan | 30.0 | 03 3 |
| Tian Mingjian , 31 | 09.20 Sep. 20 | 1994.0 | Beijing | China | 23.0 | 30–80 |
| Michael Zhu | 04.00 April | 1950.0 | Nainital | India | 22.0 | 0.0 ? |
| Rz | 06.32 | 1939.9 | Cz | Cz | 100.9 | 100.9 |
| Unknown | 04.01 April 1 | 1978.0 | Dong Doc | Laos | 16.0 | 60 |
| Bales, Robert , 38 | 03.11 March 11 | 2012.0 | Najeeban & Alkozai | Afghanistan | 16.0 | 6 |
| Yuan Daizhong, 41 | 11.18 Nov. 18 | 2004.0 | Yueyang & Xima | China | 15.0 | 28 |
| Harphul Singh | 07.23 July 23 | 1930.0 | Tohana | India | 15.0 | 0.0 ? |
| Ramesh Sharma , 28 | 07.23 July 23 | 1983.0 | Mandsaur | India | 14.0 | 09 9 |
| Tz | 08.32 | 1999.9 | Lz | Iz | 100.9 | 100.9 |
| Hu Wenhai, 46 Liu Haiwang, 40 | 10.26 Oct. 26 | 2001.0 | Dayukou | China | 14.0 | 03 3 |
| Unknown Soldier | 06.14 June 14 | 1912.0 | Guangzhou | China | 14.0 | 02.1 2+ |
| Unknown | 08.00 Aug. | 1938.0 | Bhatinda | India | 12.0 | 08 8 |
| Shi Yuejun , 35 | 09.24 Sep. 24–29 | 2006.0 | Liuhe & Tonghua county | China | 12.0 | 05 5 |
| Duong Van Mon, 35 | 08.08 Aug. 8 | 1998.0 | Đắk Lắk Province | Vietnam | 12.0 | 02.6 2–6 |
Question:
What is the average Year, when Date is "04.01 April 1"?
Answer:
1978.0