The Irish figures aren’t that much higher. The 2011 Irish census has some 66,000 Irish speakers in the Gaeltacht areas, roughly two thirds of the population in those regions. This is not the same as monolingual, however, as undoubtedly some of these Irish speakers also speak English as a second language. The census also says a little over half of those in the Gaeltacht age 3–4 speak Irish; that tells you something about how well it’s surviving as a native tongue. (The difference between 66% for all ages and 50% for children could be accounted for by either a decline in those speaking it as a native tongue or by people moving to the areas and learning the language.) The Gaeltacht are the regions of Ireland where Irish remains the predominant language.
IIRC, the number of native speakers at the beginning of the twentieth century was only around 40,000, so the population of native speakers hasn’t risen all that much. The number of speakers of Irish as a second language, however, has increased dramatically.
For the Irish census figures see: http://www.cso.ie/px/pxeirestat/Statire/SelectVarVal/Define.asp?maintable=CDD34&PLanguage=0