you can't rely on official statistics when it comes to things like the income. The true income is always higher.
I was told this too. Also, I was told that "Polish people like to complain." That was told me by a Polish lady after she told me that Poles will always tell you their official 'low" amount they are making. What they fail to tell is that they may have two or three sources of income.
I'm finding this to be true...