Subtropical high ridge/˚N

Subtropical high north/˚N

Westward ridge/˚E

Area index

/10⁵ km²

Intensity index

/10⁶ km²∙dagm

1958

31

31

120

23

40

1966

30

34

124

23

41

1973

22

34

107

24

53

1983

21

29

105

28

55

1988

22

24

115

26

55

1998

25

34

92

37

73

Average in strong El Niño years

24.5

31.0

110.5

32.2

52.8

Multi-year average

25.4

30.8

119.5

21.2

38.6

2016

29

33

109

21.5

53