The German Sign Language is used not only by around 80,000 deaf people, but also by people with cochlear implants or children of deaf parents.
Source: UNESCO. German Sign Language – DGS
Deaf culture
Quote
The percentage of Montana students ages 6-21 with hearing impairments in 2011 was .05%.
…
There are 16,554 individuals aged 18-64 who are deaf.
Source: Montana Department of Public Health and Human Services. Hearing Impairment
Quote
Deafness is much broader than just a hearing loss; it is a complex sociopolitical reality that permeates one’s life.
Roslyn Rosen
Quote
In the UK, 8% of profoundly deaf people communicate by sign language alone. They don’t read English.
Sarah Winters, Accessibility is usability