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 | Additional Notes |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Kehoe, Andrew Philip , 55 | 05.18 May 18 | 1927.0 | Bath Township , MI | U.S. | 44.0 | 58 | Committed suicide |
| Cho, Seung-Hui , 23 | 04.16 April 16 | 2007.0 | Blacksburg , VA | U.S. | 32.0 | 17 | Committed suicide |
| Lanza, Adam Peter , 20 | 12.14 Dec. 14 | 2012.0 | Newtown , CT | U.S. | 27.0 | 02 2 | Committed suicide |
| Hamilton, Thomas Watt , 43 | 03.13 March 13 | 1996.0 | Dunblane | U.K. | 17.0 | 13 13–15 | Committed suicide |
| Steinhäuser, Robert , 19 | 04.26 April 26 | 2002.0 | Erfurt | Germany | 16.0 | 01 1 | Committed suicide |
| Hz | 03.32 | 1999.9 | Dz | Cz | 10.9 | 09.9 | Zz |
| Whitman, Charles Joseph , 25 | 07.31 July 31 / Aug. 1 | 1966.0 | Austin , TX | U.S. | 15.0 | 32 | Shot by police Killed an unborn child |
| Kretschmer, Tim , 17 | 03.11 March 11 | 2009.0 | Winnenden & Wendlingen | Germany | 15.0 | 09.13 9–13 | Committed suicide |
| Lépine, Marc , 25 | 12.06 Dec. 6 | 1989.0 | Montreal , QC | Canada | 14.0 | 14 | Committed suicide |
| Harris, Eric David , 18 Klebold, Dylan Bennet , 17 | 04.20 April 20 | 1999.0 | Columbine , CO | U.S. | 13.0 | 21 | Both committed suicide |
| Gadirov, Farda , 28 | 04.30 April 30 | 2009.0 | Baku | Azerbaijan | 12.0 | 13 | Committed suicide |
| Mz | 04.32 | 2008.9 | Mz | U.Kz | 14.9 | 14.9 | Zz |
| Menezes de Oliveira, Wellington , 23 | 04.07 April 7 | 2011.0 | Rio de Janeiro | Brazil | 12.0 | 12 | Committed suicide |
| Bai Ningyang , 18 | 05.08 May 8 | 2006.0 | Shiguan | China | 12.0 | 05 5 | Sentenced to death |
| Seifert, Walter , 42 | 06.11 June 11 | 1964.0 | Volkhoven | West Germany | 10.0 | 22 | Committed suicide |
| Saari, Matti Juhani , 22 | 09.23 Sep. 23 | 2008.0 | Kauhajoki | Finland | 10.0 | 01.3 1–3 | Committed suicide |
| Wu Huanming , 47 | 05.12 May 12 | 2010.0 | Linchang | China | 9.0 | 11 | Committed suicide |
Question:
On what Date did the massacre result with 21 Injured?
Answer:
04.20 April 20