Well, you have a point there. It's Germany's lowest unemployment rate because since 1989. Also take a good look at the slope[1].
[1] http://www.tradingeconomics.com/germany/unemployment-rate
[1] http://www.tradingeconomics.com/germany/unemployment-rate
This is simply false, and I wonder where you got this idea from. During the 1960s, the (West) German unemployment rate hovered around 1%, i.e. much lower than today.
There's no doubt that Germany is doing well compared to other countries today, but be careful about such statements about history. Germany could be doing even better.