European ideal has altered

AS AN ORGANISER for No in 1975, I had, over time, come to support the European concept, my business was one if the first to benefit. 
After visiting 27 EU nations, plus all current accession candidate countries, is it not a fact the vast majority of economic migrants are uninterested in community integration? 
Ten EU 2004 accession countries, six of whom are smaller than Wales, all having more MEPs, having used structural funding financially supported by us wisely, E.G. Malta and Slovenia have already passed Welsh GDP % growth rate, why? Is there any evidence of our English cousins, many elderly retired, concerned by immigration challenging their local communities, choosing to resettle to Wales, disproportionately impacting our health and social services, especially in coastal and rural areas? Can anyone without referring to further shameful deprivation handouts to Wales help the many undecided / leave voters, why we should support a remain vote?