I'd love to look at the graph, including the source article, which you'll notice Gerry still hasn't provided.
http://www.migrationwatchuk.org/statistics-net-migration-statistics
You discount education then?
More or less, yes. Experience nearly always ends up counting for more than education, as you and everyone else knows perfectly well.
There's no fool like an old fool.
The most extreme fools are people whose age should have made them wise.
To return to your graph of net migration. It is as I suspected, UK net migration is directly linked to UK GDP. Whether there is a causal relationship, I suspect there is.
http://www.bbc.com/news/10613201
By using the original graphs, in both cases, it's possible to pinpoint precise years.
1991, a sudden reversal in net migration. The reduction of GDP came first, starting in 1990.
1995, a reversal in net migration lasting until 1997. 1995 Q1 a sudden reduction in GDP, mirrored in 1996 Q4.
2008 lasting until 2009, a reduction in net migration. 2007 Q4 lasting until 2009 Q2 a reduction in GDP.
2011 - 2012 a reduction in net migration. 2011 Q2 to 2012 Q4 a reduction in GDP.
It would take further research to identify whether the immigration is more influenced by EU or non-EU migrants during periods of reduction in GDP.
I suspect it's more EU influenced, than non-EU.
Unless, of course, the immigration causes the growth or reduction in GDP.
An indication of the relationship between immigration and GDP could probably be deduced by the relatively larger numbers of immigrants attracted to areas with low unemployment.
Additionally, by identifying only EU immigration, 2004 saw a large increase, (by 2007 it had more than tripled) coinciding with Poland and seven others joining EU. If I recall correctly the government of the day waived the right to restrict new immigration for 7 years, whereas the rest of the EU countries did restrict immigration from newly joined countries.
Whereas a new list of countries joining in 2007 did not see any increase in EU immigration.
So, in summary, a Brexit will probably incur a sea of EU migrants emigrating, probably in search of work because Brexit will cause a downward trend in our economy.
Now if you also check the GPD per capita graph, you'll see that a case could be made for the benefit of immigration.
http://www.tradingeconomics.com/united-kingdom/gdp-per-capita