"The state subsidy paid through the Workers’ Welfare Foundation, a scheme supervised by the Ministry of Employment and Social Protection, which collects funds from all paid employees (both union and non-union members) as well as from employers for the primary purpose of providing social services to employees, is the basic source of funding for the unions since in effect union dues play a part only in the public-sector unions."
In fact, our Unions can by law get up to 25% of the Workers' Welfare Foundation's budget, and no less than 15% per year. This would suggest a 2008 budget of EUR 35m. (Weird source for me to cite, I know, but they know their stuff.)
But perhaps for all this we buy more security for our workers. Well the evidence is mixed but, according to at least one comprehensive review of industrial relations in individual EU countries (not by neoliberals but by the union-loving Germans),
"Stricter employment protection legislation [and a] higher […] minimum wage are likely to reduce both employment and activity rate[...] On the other hand, collective bargaining over wages and political orientation of the government do not have [a] significant effect on labour markets[’] performance."