I have invested in the ATP edition of the Tennis Navigator software and have been looking through the varied reports and feature of what basically is an updated SQL database of the ATP tour.

One thing it shows very clearly for any player is their ranking history....

Ranking & Number of weeks at that range :

60's - 6 weeks
50's - 0 weeks
40's - 20 weeks
30's - 5 weeks
20's - 2 weeks
10's - 19 weeks

Total 52 weeks....

His 20 weeks in the 40's was his poor run of form from April until the start of SW19.

His rise and run in the 10's is down to his US Open series run.

His biggest ranking fall in one week was 5 (Twice 03/04 & 12/06) 

His biggest ranking rise in one week was 13 (20/02San Jose)

Here is the chart for his rankings2006 from the program....



If anyone wants me to look into another top ATP player then just let me know.