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O’Hara’s Irish Craft Beer are celebrating 20 years of brewing with the launch of a limited edition Imperial Stout; a complex brew which delivers a viscous yet smooth mouthful, and aromas of coffee and chocolate.

To mark the occasion, here's 13 things you didn't know about craft beer in Ireland:

1. There are around 75 independent craft breweries on the island of Ireland now and that number increases every year.

2. The market is growing incredibly fast and now makes up 2% of the overall beer market in Ireland.

3. If you think craft beer is all about hoppy IPAs you are wrong! Craft beer is a celebration of all kinds of different flavours and tastes so there's a style for everyone, from stouts to lambics, from red ales to pilseners and everything in between.

4.Most styles of Irish beer, including stout and red ale, evolved from English predecessors. Only one style has a true claim to Irish roots: heather ale. Beann Gulban by The White Hag brewery is a modern example.

5.Micro-brewing is six times more labour intensive than macro brewing. In mid-2015 microbreweries employed 312 people with 159 extra jobs created in the previous year.

6. Irish microbrewing owes a great deal to former Taoiseach Brian Cowen: as Minister for Finance in 2005 he introduced the small brewery tax relief which allowed the sector to grow. One brewery even made a beer in his honour -- "Brian Brew".

7. An Irish brewery can produce over 5 million pints of beer a year before it no longer qualifies as micro.

8. It's not a totally new sector in Ireland but Carlow Brewing Company - who produce O’Hara’s Irish Craft Beers - were formed in 1996, as was The Porterhouse, which opened its first brew pub in Temple Bar the very same year.

9. Irish Craft Beers are now heavily exported across the world with the US, France, Italy, Russia and the UK the biggest export markets.

10. We are now seeing a great number of pubs in Ireland that only sell craft beer. Galway Bay Brewery have 11 craft beer pubs in Dublin and Galway. The Porterhouse have bars in Dublin, Cork and Wicklow.

11. There are a host of craft beer festivals across Ireland. The biggest one is ‘The Irish Craft Beer & Cider Festival’ in September in the RDS, whilst there is also the Alltech Brews & Food Festival in February, Doolin Craft Beer Festival in August and the Killarney Beer Festival in May.

12. Almost every county in Ireland now has its own craft brewery: Laois, Westmeath and Armagh are the only current exceptions.

13. Ireland's organisation for beer enthusiasts, Beoir was founded in 2010 and has over 600 members.