Year of diagnosis | Number of cases per year | Annual estimate of population | Ratio | Incidence rate per 100,000 inhabitants |
1988 | 3 | 8,356,305 | 3.5901E−07 | 0.04 |
1989 | 8 | 8,579,823 | 9.3242E−07 | 0.09 |
1990 | 5 | 8,811,034 | 5.6747E−07 | 0.06 |
1991 | 5 | 9,050,084 | 5.5248E−07 | 0.06 |
1992 | 2 | 9,297,113 | 2.1512E−07 | 0.02 |
1993 | 7 | 9,552,476 | 7.3279E−07 | 0.07 |