Department of Transport and Main Roads Contract Disclosure Report (Contract Value > $10K)

I'm interested in the Department of Transport and Main Roads Contract Disclosure Report (Contract Value > $10K) on the portal. I have a few questions: Do the available datasets include contracts from all TMR departments? Are reports available for years before FY 20-21? If so, how can I get them? If older reports aren't on the portal, is there a chance they could be added in the future?

Thank you for your help!