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:
| Club | Position in 2012–13 | First season in top division | Number of seasons in top division | Number of seasons in Prva HNL | First season of current spell in top division | Top division titles | Last top division title |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Dinamo Zagreb a,b | 001 1st | 1946–47 | 68.0 | 23.0 | 1946–47 | 19 c | 2012–13 |
| Hajduk Split a,b | 004 4th | 1923 | 86.0 | 23.0 | 1923 | 15 d | 2004–05 |
| Hrvatski Dragovoljac | ZZZ 1st in 2.HNL | 1995–96 | 9.0 | 9.0 | 2013–14 | 0 | N/A |
| Istra 1961 | 006 6th | 2004–05 | 8.0 | 8.0 | 2009–10 | 0 | N/A |
| Lokomotiva b | 002 2nd | 1946–47 | 15.0 | 5.0 | 2009–10 | 0 | N/A |
| Osijek a,b | 007 7th | 1953–54 | 38.0 | 23.0 | 1981–82 | 0 | N/A |
| Rijeka a,b | 003 3rd | 1946–47 | 52.0 | 23.0 | 1974–75 | 0 | N/A |
| Slaven Belupo b | 008 8th | 1997–98 | 17.0 | 17.0 | 1997–98 | 0 | N/A |
| RNK Split b | 005 5th | 1957–58 | 6.0 | 4.0 | 2010–11 | 0 | N/A |
| Zadar a | 009 9th | 1992 | 18.0 | 18.0 | 2006–07 | 0 | N/A |
Question:
Name the average number of seasons for Prva HNL of 17
Answer:
17.0