nowhere near 99%, never has been, certainly isn't now.
Loads and loads and loads of employees right now are accepting things are very very bad and taking redundancy/significant short working/significant pay cuts/decrease in conditions without going on strike.
Even workers in the car industry, a complete basket case only 30 years ago, are accepting significant changes so their employer might survive.
1200 people at the mrs' company were told recently that their jobs are almost certainly going. They aren't going on strike, they aren't exactly happy, but they know that walking out isn't going to do anything. Plenty of other companies are doing the same.
A significant number, certainly a large majority, of BA employees haven't had the attitude change yet that the other 1980's privatised company employees have had to go through. I suspect they never will.