Before that, for the general reader a word on statistics, Consider that a coin can either be heads or tails so a single flip has a 50 50 chance of being heads or tails. Flip 1000 coins, one time and maybe x % will be heads and y% will be tails. Do that 1000 times and average the percent that are heads and the percent that are tails and those averages will be close to 50-50. \cite{lewis2012}
The statement that 45% of transgender women attempt suicide is just like that. In a given year one either tries to kill themselves or they do not. Saying that 45% of transwomen do would lead to the population crashing.
Starting with the general population times the prevalence of transgender people of 380 per 100,000 \cite{Meerwijk2017}. Times the population of the United States of America as of March 2018 of approximately, G, 330 million \cite{us}.
\(P_0=Gt_p\)
Subsequent years are computed from this formula. The transgender population in year y is equal to the product of one minus the product of the fraction of suicide attempts and suicide successes with the size of the transgender population the previous year. Then add the number of people born times the percentage of births that will be someone who eventually comes out as transgender 0.01%. Computed simply by dividing the number of transgender people by 50 and not meant to claim anything about the etiologies(s) or cause(s) of transgenderism.
\(P_y=P_{y-1}\left(1-S_AS_S\right)+Bt_b\)
A summary of the spreadsheet calculation is here in figure 1. The excel file is attached.