Consider a firm, whose marginal probabilities of default in each year are as follows:

Year	Marginal probability of default (%)
1	2.7
2	6.6
3	4.1
4	2.8
5	9.4

Calculate the firm's 4-year cumulative probability of default.

(If your solution is 4.44% then enter "4.44" as the answer. Precision is 0.01+/- 0.02.)