This is a complete and utter fabrication!!! What, do you think you just get to make shit up and no-one is going to call you on it? Let me give you the numbers here, real numbers in USD you too can check at https://data.oecd.org/gdp/gross-domestic-product-gdp.htm:The funny thing about all those countries you mention (Denmark, Finland, Sweden, Norway and New Zealand and Canada) is they ALL lost 15% or more of their GDP in 2015...and you want to listen to THEM?
2014 GDP 2015 GDP Percent Change
Denmark 47,810 48,994 2.5%
Finland 41,504 42,268 1.8%
Sweden 46,405 47,823 3.1%
Norway 65,658 62,025 -5.5%
New Zealand 36,983 37,223 0.6%
Canada 45,083 44,201 -2.0%
As you can clearly see, all but two of the countries you claim "lost 15% of their GDP in 2015" actually increased their GDP in 2015. The two who actually did "lose GDP" had a decline of 2% and 5.5% respectively, which is a far cry from 15%.
I expect that now you realize that you've been duped by whoever you're getting your news from, you'll change your worldview...just a little tiny bit...to reflect reality? No, too much to ask?
We had a bit a slowdown yes, due to the stupid Saudi choosing to violate the oil production quota that drove the oil prices down to s***. And we are fixing that right now to try to branch off to alternative energy, something that our last PM should've done long time ago instead of protecting his oil-producing home province.