This trend has implications for declining costs in education but also lower higher education participation, a factor which may limit future economic growth. The number of female workers is higher than male workers, reflecting the opportunities for women workers in the assembly operations in the manufacturing sector. The overall working age group (15-64) increased from 55.40% in 1970 to 61.70% in 2000. It is estimated to stabilise at 68.40% in 2010, dipping to 67.00% in 2020.