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:
| Rank | Previous Rank | Name | Nationality | Team | Points |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 1 | Davide Rebellin | Italy | Gerolsteiner | 157.0 |
| 2.0 | 2 | Alejandro Valverde | Spain | Caisse d'Epargne | 107.0 |
| 3.0 | 3 | Danilo Di Luca | Italy | Liquigas | 100.0 |
| 4.0 | 4 | Óscar Freire | Spain | Rabobank | 82.0 |
| 5.0 | 5 | Stuart O'Grady | Australia | Team CSC | 79.0 |
| 6.0 | 6 | Stefan Schumacher | Germany | Gerolsteiner | 75.0 |
| 7.0 | 7 | Fränk Schleck | Luxembourg | Team CSC | 63.0 |
| 8.0 | 8 | Juan José Cobo | Spain | Saunier Duval-Prodir | 62.0 |
| 9.0 | 9 | Alberto Contador | Spain | Discovery Channel | 58.0 |
| 10.0 | 10 | Tom Boonen | Belgium | Quick Step-Innergetic | 57.0 |
| 11.0 | – | Thomas Dekker | Netherlands | Rabobank | 55.0 |
| 12.0 | 11 | Andreas Klöden | Germany | Astana | 53.0 |
| 13.0 | 12 | Alessandro Ballan | Italy | Lampre-Fondital | 50.0 |
| 14.0 | 13 | Matthias Kessler | Germany | Astana | 50.0 |
| 15.0 | 18 | Robbie McEwen | Australia | Predictor-Lotto | 47.0 |
Question:
Tell me the sum of rank for australia when points are less than 79
Answer:
15.0