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This shows the cumulative number of cases of AIDS in the USA (second column) in 4 month intervals from 1982. The first column shows the quarter since 1982. Data from "Backcalculation of flexible linear models of the Human Immunodeficiency Virus infection" by P.S. Rosenburg and M.H. Gail, Applied Statistics, Volume 40, 1991, 269-282, Table 1.

1st col	2nd col
0	374
1	559
2	759
3	1052
4	1426
5	1980
6	2693
7	3456
8	4313
9	5460
10	6829
11	8392
12	10118
13	12260
14	14785
15	17736
16	20896
17	24715
18	29036
19	33899
20	39091
21	45246
22	52062
23	59553
24	67279
25	75762