The graph;
Resembles exponential growth to me, ..... compare the gradient of the 1997/1998 section to later, it's not as steep, is it? Thankyou, you've made my point for me.
Correct. But look at the early numbers and you can see where it first really begain to get popular usage. Even though the later numbers certainly show a greater rate, the jump from '96 to '98 is actually HUGE, percentage-wise!