Table:
antigen
2 years
7 years
17 years

females
males
females
males
females
males

percent

diphtheria
78.3
75.1
70.8
71.8
55.3
54.1

pertussis
78.0
74.9
70.6
71.1
53.2
51.0

tetanus
78.0
74.9
70.6
71.3
55.3
54.6

polio
91.4
90.5
88.0
90.8
85.6
85.7

haemophilus influenzae type b
73.3
70.7
79.9
81.5
71.8
71.2

measles
89.7
89.7
86.4
85.1
83.3
84.6

mumps
89.6
89.2
85.2
85.0
82.8
82.6

rubella
89.5
89.3
94.4
95.0
94.1
94.0

varicella
73.7
72.7
81.9
83.3
..
..

meningococcal infection
90.3
87.4
85.5
87.6
..
..

pneumococcal infection
79.4
79.0
75.8
75.8
..
..

Statement: about 90% of 2-year-old boys were immunized against meningococcal infection.
Question: what is the percentage of 2-year-old boys were immunized agianst meningococcal infection?
Answer: [87.4]