using function

Hi,
I have some data like bellow and I want to use the fitting curve through this data as a function. I have tried the interpolation function but this error appeared

>> interpolation grid axis values must be sorted in ascending order in each dimension

11 0.35
13 0.35
14 0.355
16 0.35
23 0.341
28 0.3365
33 0.33
36 0.3225
37 0.31
38 0.32
40 0.312
42 0.2908
44 0.284
45 0.282
47 0.2608
48 0.25
49 0.242
50 0.235
51 0.2288
52 0.205
53 0.206
54 0.1996
55 0.2
56 0.1819
59 0.164
60 0.17
61 0.178
62 0.1549
64 0.155
65 0.145
66 0.16
67 0.14
68 0.134
69 0.146
70 0.138
74 0.134
77 0.126
79 0.124
84 0.119
89 0.114
94 0.1
104 0.1