AAP: VICTORIA has experienced a 40 per cent decrease in autumn rainfall since 1950 and climate change is a key factor, a report has found. There were also seasonal rainfall declines in Western Australia’s southwest and southern Queensland. A reduction in the number of La Nina events and changes in weather systems from the Indian Ocean were also partly responsible for late rainfall across Victoria, the CSIRO’s Wealth From Oceans Flagship study found. During the past 58 years, …