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:
| Year | Competition | Venue | Position | Event | Notes |
| --- | --- | --- | --- | --- | --- |
| 1975 | Asian Championships | Seoul, South Korea | 1st | 5,000m | 14:00.8 |
| 1979 | Asian Championships | Tokyo, Japan | 2nd | 10,000m | 29:00.2 |
| 1981 | Asian Championships | Tokyo, Japan | 1st | 10,000m | 28:53.29 |
| 1981 | Fukuoka Marathon | Fukuoka, Japan | 2nd | Marathon | 2:09:37 |
| 1982 | Fukuoka Marathon | Fukuoka, Japan | 4th | Marathon | 2:11:45 |
| 1983 | World Championships | Helsinki, Finland | 28th | 10,000m | 29:49.04 |
Question:
how many times did japan place in the top 2?
Answer:
4