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EURO STOXX 50 was quoted only starting 1998 but its prices were calculated retroactively back to the year 1986. The base value is 1000 points, referenced on 31 December 1991.
The following table shows the end-of-year values of the EURO STOXX 50 index since 1986. Index values before 1999 are based on the euro's predecessor, the European Currency Unit (ECU).
From Wikipedia’s article on EURO STOXX 50, shared under CC BY-SA 4.0.4
