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:
| Season | Ep # | Season Premiere | Season Finale | Ranking | Viewers (Households in millions) | Rating |
| --- | --- | --- | --- | --- | --- | --- |
| Season 1 | 24.0 | September 17, 1972 | March 25, 1973 | #46 | N/A | N/A |
| Season 2 | 24.0 | September 15, 1973 | March 2, 1974 | #4 | 17.02 | 25.7 |
| Season 3 | 24.0 | September 10, 1974 | March 18, 1975 | #5 | 18.76 | 27.4 |
| Season 4 | 24.0 | September 12, 1975 | February 24, 1976 | #15 | 15.93 | 22.9 |
| Season 5 | 24.0 | September 21, 1976 | March 15, 1977 | #4 | 18.44 | 25.9 |
| Season 6 | 24.0 | September 20, 1977 | March 27, 1978 | #9 | 16.91 | 23.2 |
| Season 7 | 25.0 | September 18, 1978 | March 12, 1979 | #7 | 18.92 | 25.4 |
| Season 8 | 25.0 | September 17, 1979 | March 24, 1980 | #5 | 19.30 | 25.3 |
| Season 9 | 20.0 | November 17, 1980 | May 4, 1981 | #4 | 20.53 | 25.7 |
| Season 10 | 21.0 | October 26, 1981 | April 12, 1982 | #9 | 18.17 | 22.3 |
| Season 11 | 16.0 | October 25, 1982 | February 28, 1983 | #3 | 18.82 | 22.6 |
Question:
What is the rating of the season 10?
Answer:
22.3