Table 17.  Frequency With Which Current Subscribers Have Switched Market Advisory Services
   
Frequency Percentage
 
Several times a year 2.2
Twice a year 2.6
Once a year 5.9
Once in two years 15.4
Once in three years 15.1
Once in four years 8.4
Once in five years 12.6
Once in ten years 9.6
Until now I have never switched 28.1