t (months)

The rate of deterioration from baseline in the production and storage of different month ferrate VI (%)

The monthly rate of degradation ferrate VI (%)

1

0.7

0.7

2

1.7

1.07

3

3.57

1.81

4

6.42

2.96

5

7.5

1.14

6

9.64

2.31

7

29.28

2.17

8

36.78

10.60

9

38.21

2.25

10

62.5

3.93

11

73.21

28.57

12

81.42

30.66