You've been reading 'Statistics for Dummies' again. These percentages are meaningless in isolation. Of the 11% who export to the Eu how much of their activity involves companies who don't? Of the 89% who don't, how much of their activity involves purchaes from the EU?
And again, just quoting a percentage of companies doesn't reflect the size of those companies nor the number of people that they support, either dirctly or indirectly.
What makes you think that any comnpany can become 'more competitive on the global stage' just because it is no longer operating within the ecosphere of the Single Market? What would they be able to do in the future that they can't do now?