dataset=belgium
begin description
Belgium telephone data from
Rousseeuw and Leroy (1987, p.
end description
begin variables
col 0 = case
col 1 = x = year
col 2 = y = number of calls in tens of millions
end variables
begin data
 1 50 0.44
2 51 0.47
3 52 0.47
4 53 0.59
5 54 0.66
6 55 0.73
7 56 0.81
8 57 0.88
9 58 1.06
10 59 1.2
11 60 1.35
12 61 1.49
13 62 1.61
14 63 2.12
15 64 11.9
16 65 12.4
17 66 14.2
18 67 15.9
19 68 18.2
20 69 21.2
21 70 4.3
22 71 2.4
23 72 2.7073
24 73 2.9