The prices of wheat have fluctuated greatly over time and have shown large intra-year volatility. The World bank has estimated wheat price instability indices as 11.0, 15.5 and 13.5 percent in the decades of 1980s, 1990s, and the 2000s (Source: World Bank, worldbank.org) World wheat prices declined at an average of 6.1 percent per annum during the 1980s, grew at an average of 0.20 percent per annum during the 1990s and grew at an average of 5.8 percent per annum in the decade beginning 2000.