The line graph above illustrates the data about the millions of minutes spent on phone calls on three different lines between 1995 and 2004.
Overall, while Mobile numbers has seen a progressive increase reaching high peaks, International landline slightly grew and National landline, after moving upwords for a many years, concluded with a steep fall.
In the first 4 years all three the cathegories were steadily growing, especially the National landline. In fact, the latter, initially, had a higher starting point, with a concrete gap of around 11 million minutes from Mobile. With regard to International landline, back in 1995, it was right in the middle at 6 million. However, from 1999 to 2002, the trend change is evident, while the green line in 2000 starts to arise, in 2001 the blue one saw the beginning of its decline phase. This trend got confirmed in the following years, when Mobile finally surpasses the National landline at the beginning of 2004. On the contrary, throughout this whole period, International landline remained stable in its slight but constant increase.