Quotation from the Vice website article:
"a 2013 report by the National Coalition of Anti Violence Programs in the US found that trans women were almost twice as likely to experience sexual violence as non-trans people."
BUT
"A 2011 survey of 6,456 transgender and gender non-conforming people in the United States found that up to 20% of the trans women surveyed had been subjected to sexual assault. Specifically, 12% of the trans girls and 20% of the trans women prison inmates, who were surveyed, reported sexual assault. This compares, for example, to a 2009 survey of 5,446 US college women, most of whom were not trans, which found that 19% of these women had experienced sexual assault during their time at college."
quoted from the Transmisogyny article in Wikipedia, based on the following sources:
"Injustice at Every Turn: A Report of the National Transgender Discrimination Survey". National Gay and Lesbian Task Force.
Sexual Violence - Facts at a Glance published by Centers for Disease Control and Prevention .
Krebs, C.P. et al. (2009) College women's experiences with physically forced, alcohol- or other drug-enabled, and drug-facilitated sexual assault before and since entering college, Journal of American College Health, volume 57 number 60, pages 639-47. doi: 10.3200/JACH.57.6.639-649.