I can't find the original article I read months ago as searching brings up thousands of results, but there are lots of opinions from economists that the EU is not the healthy trading partner many people seem to assume.
But your quotes don't support this view:
But the share of UK exports of goods and services going to the EU has fallen, from 54% in 2000 to 43% in 2016. Which shows that the UK was able to increase trade with the rest of the world whist still being a member of the EU, contradicting one of the main Brexit arguments.
Most of the decline in the EU’s share of UK exports is due to goods, not services. Services sold to the EU are a huge export earner for the UK, which is why leaving the EU and closing off this lucrative market is sheer folly. The much-touted Canada-style deal would not include services. 'No Deal' would destroy the UK services exports overnight.
The US is the country from which the UK earns the most through trade. Exports to the US in 2016 were worth £100 billion, more than twice as much as exports to any other country. It is no longer meaningful to describe export markets by single country. The world is now divided into trading blocs (EU, MERCOSUR, ASEAN etc), and the EU as a bloc is by far the UK's largest export market, accounting for well over twice as much in export earnings as the USA - and rather conveniently, it is just 22 miles away, has exactly the same standards as the UK and is linked to the UK by a fast, reliable transport system.
While the value of UK exports to the EU has fallen between 2011 and 2016 (from £243 billion to £236 billion), the UK is increasingly exporting to the US. Exports to the US rose by more than 26% over the same period. A 2% fall in the value of exports to the EU over 5 years is miniscule - and again, the UK was able to increase trade, in this case to the USA, without leaving the EU. No Brexit supporter or economist has yet explained why throwing away free and frictionless access to a market that takes 45% of exports is a good idea, nor how these export earnings are to be replaced.