Fix wrong electricity consumption in tutorial (iiasa#203)

The old link does not work any longer (404 error), but 17000 GWh
electricity consumption per year is probably a typo and should be 71000
GWh (in 2016 it rose to 72000 GWh).

tutorial/westeros/westeros_baseline.ipynb

@@ -398,7 +398,7 @@
  }
  },
  "source": [
- "Note present day: [~17000 GWh in Austria](http:https://www.iea.org/statistics/statisticssearch/report/?country=AUSTRIA&product=electricityandheat&year=2015) with population [~9M](https://www.austria.org/population/) which is ~1890 kWh per capita"
+ "Note present day: [~72000 GWh in Austria](https:https://www.iea.org/statistics/?country=AUSTRIA&year=2016&category=Energy%20consumption&indicator=undefined&mode=chart&dataTable=INDICATORS) with population [~8.7M](https://www.austria.org/population/) which is ~8300 kWh per capita"
  ]
  },
  {