1, the enrollment rate in the year before school is equal to the actual enrollment in the year before school divided by 5 MINUS the number of children who should enter school at the age of 6.

2. The enrollment rate in the first two years of school is equal to the actual enrollment in the first two years of school divided by four MINUS the number of children who should be enrolled at the age of six.

3. The enrollment rate in the first three years of school is equal to the actual enrollment in the first three years of school divided by 3 MINUS the number of children who should be enrolled at the age of 6.