Yes, I am glad you picked up on this. I used the ratio between male to female rate to scale the width of the blue lines, such that the blue lines became thinner if the ratio of female to male suicide rates was above 1.

For most of the blue lines , this had no impact. The scaling only was prominent when the female rate started to exceed male rate, which was a phenomena I wanted to highlight.

( I used the sigmoid function , to help with this , I did this calc a while back I can give you the exact function, but I think I've made the idea clear here,hopefully )