Check if Series has many bad outcomes one after another

Question

I have many Series like this:

0   0.1
1   -0.1
2   -0.2
3   0.14
4   0.17
5   -0.34
6   -0.78
7   -0.22
8   -0.9
9   -0.01
10  0.12
11  0.13
12  0.22
13  -0.2