The graphs below show the average time of top 5 runners within each 5 years according to racial origin (European/white: thick white line, West Africans in the 200-400 m: thick black line, East Africans in the 800 m-10 km: thick brown line). The best time of a white runner (thin white line) is also added.

 

                      

 

 

These graphs depict the best time of the year+the average time of Top 10 performers

 

 

 

 

 

 

The graphs below show the number of athletes that have broken the world record valid in 1988. For better objectivity, I excluded all times achieved at altitude, and the world record in the 200 m is thus Lewis' 19.75 from 1983. Color distinguishes athletes by racial origin (white=whites, brown=East+South Africans, blue=other)