Detailed Instructions: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: Large-scale emigration marked most of the post-WWII period (particularly during the 1950s and 1980s), but beginning in 1987 the economy improved, and the 1990s saw the beginning of substantial economic growth. This period of growth became known as the Celtic Tiger. The Republic's real GDP grew by an average of 9.6% per annum between 1995 and 1999, in which year the Republic joined the euro. In 2000, it was the sixth-richest country in the world in terms of GDP per capita.
A:
when did ireland became a first world country