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 | Event | Venue | Place | Weight class (kg) |
| --- | --- | --- | --- | --- |
| 1963.0 | FILA World Championships | Helsingborg , Sweden | 4th | 97.0 |
| 1964.0 | Olympic Games | Tokyo , Japan | 2nd | 97.0 |
| 1965.0 | FILA World Championships | Tampere , Finland | 4th | 97.0 |
| 1966.0 | European Championships | Essen , Germany | 3rd | 97.0 |
| 1966.0 | FILA World Championships | Toledo , United States | 5th | 97.0 |
| 1967.0 | European Championships | Minsk , Soviet Union | 3rd | 97.0 |
| 1968.0 | European Championships | Västerås , Sweden | 3rd | 97.0 |
| 1968.0 | Olympic Games | Mexico City , Mexico | 4th | 97.0 |
| 1969.0 | European Championships | Modena , Italy | 1st | 100.0 |
| 1970.0 | European Championshipss | Berlin , Germany | 1st | 100.0 |
| 1970.0 | FILA World Championships | Edmonton , Canada | 1st | 100.0 |
| 1971.0 | FILA World Championships | Sofia , Bulgaria | 1st | 100.0 |
Question:
What is the lowest weight class (kg) that has sofia, bulgaria as the venue?
Answer:
100.0