SYDNEY (Reuters) -Australian wages grew at the fastest annual pace in 15 years in the fourth quarter as low unemployment and stiff competition for workers pushed up pay deals, although analysts suspect the best is over as the economy sputters. Figures from the Australian Bureau of Statistics on Wednesday showed the wage price index rose 0.9% in the December quarter, matching market forecasts. Analysts expect wage growth would moderate from here as the red-hot labour market loosens, a welcome sign for the Reserve Bank of Australia, which has raised interest rates by 425 basis points to a 12-year peak of 4.35% to tame inflation.