I have the following data set, a panel dataset, (it is an example of what I have, the data set is much larger):

Year Individual Wage Mean_wage (this is the variable I want to create)

1998 1 60 70

1999 1 70 70

2000 1 80 70

1998 2 50 56,56

1999 2 50 56,56

2000 2 70 56,56


I would like to generate a new variable, which is the mean of the wage of each individual over the years, that is, the variable has to has the same value of the individual over the years. Probably, it's not clear, so I have create the variable mean_wage as an example. Anyone can help me?

Thanks!