You're correct as far as there being an increase. I mistakenly thought it was in nominal figures and it's not.
You are also correct in that there is no correlation in your chart between unintended pregnancies and birth control. Mainly because your chart doesn't go back far enough in time to see the impact from when contraceptives first became popular.
And your chart still has no correlation to the OP.
The OP, however, shows a drastic drop in teenage pregnancies following Colorado giving out contraceptives to teens for free. There is no other explanation for the drop in pregnancies.
Teens could be having less sex, that is one explanation off the bat I could think of. There could be a correlation, but at this point, one has not been established, one has been suggested by the governor.
However, even if that is true, not only teens get pregnant. As the data shows, unintended pregnancies are up nationally, and as I talked about and cited in earlier posts, the technology shock on social attitudes provided by birth control brought to the masses resulted in the normalization of out of sex outside marriage and children out of wedlock. This wasn't just me saying it, it was the liberal Brookings Institution.
So what I am trying to do is provide a broader context to this conversation, and show that there is no statistical evidence increased subsidies will reduce the problem of unintended pregnancies or out of wedlock births.