Line plot 2 Y axis

Dear all,

Imagine I have groups of 5 variables called gdp1 gpd2 gdp3 gdp4 gdp5, population1 population2 population3 population4 population5.... with many observations in each variable, corresponding to 5 different years (I have the variable year, ranging 1 to 5)

I can't find how to plot the mean and standard deviations in a line with year in the horizontal axis. It would be also perfect to have two different axis, but I don't even manage with one

How can I do this?

thank you very much

joan