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 | English title | Original title | Country | Length | Participation as |
| --- | --- | --- | --- | --- | --- |
| 1956.0 | The Killers | Убийцы | Soviet Union | 19 min. | Actor |
| 1964.0 | I Am Twenty | Мне двадцать лет | Soviet Union | 189 min. | Actor |
| 1968.0 | Sergey Lazo | Сергей Лазо | Soviet Union | 89 min. | Actor, film editor |
| 1968.0 | One chance in one thousand | Один шанс из тысячи | Soviet Union | 81 min. | Artistic director |
| 1974.0 | Sour Grape | Терпкий виноград | Soviet Union | 76 min. | Artistic advisor |
Question:
Participation as of actor, film editor has what average year?
Answer:
1968.0