Return period (year)

10

20

50

100

350

500

Return level

–3.94

–4.62

–5.54

–6.26

–7.61

–8.01

Standard errors

0.273

0.411

0.748

1.14

2.14

2.50

95% CI

[–4.48, –3.41]

[–5.42, –3.81]

[–7.06, –4.07]

[–8.49, –4.03]

[–11.8, –3.41]

[–12.9, –3.10]