Interesting question Indy. The number of bills introduced, debated and passed by the Australian Parliament during a sitting week varies greatly. For example, in the last sitting week 14 bills were introduced into the Parliament (11 in the House of Representatives and 3 in the Senate) and no bills were passed by both houses. In a similar week a year ago, one bill was introduced (in the Senate) and no bills were passed.
The number of bills passed by both houses and signed into law by the Governor-General over the life of a parliament also varies. 306 bills have so far been given Royal Assent (approved by the Governor-General) in the current Parliament (the 44th) (approximately two years). Royal Accent was given to 566 bills passed in the entire 43rd Parliament (approximately three years).
You can find more information of bills introduced and passed by the Parliament on the Australian Parliament website.