SPER debt in Toowoomba and Darling Downs-Maranoa

Hi, I'm a journalist working on a story on SPER debt in the Toowoomba and Darling Downs-Maranoa region and I was hoping to access historical data on SPER debt to track how it's changed over the long term. Is it possible to get SPER debt data for Toowoomba and the Darling Downs-Maranoa region over the past 5-10 years, or whatever longer term time frame that's available?