This time trend is not as apparent among secondary and higher educated workers, though among these workers in all years the share of paid employment falls considerably with increasing experience. Figure 4.4 seems to suggest that many, particularly tertiary educated, workers do not stay in paid employment until retirement, and paid employment is not the same as a stable job. Figure 4.5 shows monthly income (in real 2005 ZAR) of South African-bom workers by levels of education and experience for each of the two census waves.