1970:   02 hours/day 3 days/week

      1976:   02 hours daily broadcast

      1985:   04 hours/day

      1990:   08 hours/day

      1993:   10 hours/day

      1995:   18 hours/day

      1997:   21 hours/day

      1998:   40 hours/day

      2002:   62 hours/day

      2004:   70.2 hours/day

      2005:   102.5 hours/day