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:
|  | Ship | Shipyard | Laid down | Launched | Completed | Fate |
| --- | --- | --- | --- | --- | --- | --- |
| 白露 | Shiratsuyu | Sasebo Naval Arsenal | 14 November 1933 | 5 April 1935 | 20 August 1936 | Collision 15 June 1944 |
| 時雨 | Shigure | Uraga Dock Company | 9 December 1933 | 18 May 1935 | 7 September 1936 | Sunk in action 24 January 1945 |
| 村雨 | Murasame | Fujinagata Shipyards | 1 February 1934 | 20 June 1935 | 7 January 1937 | Sunk in action, 6 March 1943 |
| 夕立 | Yudachi | Sasebo Naval Arsenal | 16 October 1934 | 21 June 1936 | 7 January 1937 | Sunk in action 13 November 1942 |
| 五月雨 | Samidare | Uraga Dock Company | 19 December 1934 | 6 July 1935 | 29 January 1937 | Sunk in action 26 August 1944 |
| 春雨 | Harusame | Uraga Dock Company | 3 February 1935 | 21 September 1935 | 26 August 1937 | Sunk in action 8 June 1944 |
| 山風 | Yamakaze | Uraga Dock Company | 25 May 1935 | 21 February 1936 | 30 June 1937 | Sunk in action 23 June 1942 |
| 江風 | Kawakaze | Fujinagata Shipyards | 25 April 1935 | 1 November 1936 | 30 April 1937 | Sunk in action 6 August 1943 |
| 海風 | Umikaze | Maizuru Naval Arsenal | 4 May 1935 | 27 November 1936 | 31 May 1937 | Sunk in action 1 February 1944 |
| 涼風 | Suzukaze | Uraga Dock Company | 9 July 1935 | 11 March 1937 | 31 August 1937 | Sunk in action 25 January 1944 |
Question:
how many of the shiratsuyu-class ships sank in 1944?
Answer:
4