[Not actually replying to your post so much as using the table]
The worst thing about this data is the information it
doesn't show. Put a table together of Spanish, Italian, French, German, Portuguese players playing in foreign leagues. then add English players to that table.
THAT is the most worrying statistic. If English players are not playing here, they're not playing anywhere. That's why we've got a sh1te national team.
As a rough and ready rule of thumb, the best Italians play for the best Italian clubs, with the same being true of Spanish and German players. If they're not playing for the best teams in their own country, they're playing in other countries.
But English players? It's Premier league or bust.
We currently have 4 top teams in our league that can compete for and buy top class talent. United, City, Chelsea and Arsenal. Taking into account the ability of these 4 to be able to buy the best players in every position, you've probably got space for 8 English players across 4 teams.
In not quite equal measure; Fabregas, Pedro, Mata, Herrera, Navas, Silva, Cazorla, Bellerin, are all players that couldn't get a starting spot at Barca, Real or Athletico but walk straight into our top clubs.
We concentrate so much on having English players in England we completely forget about the fact that English players elsewhere would help us a whole lot more. We shouldn't be looking to get more English players playing in England. We should concentrate on getting a bigger pool of players through any means necessary.
Admittedly English players going to Spain en masse would be a stretch. I don't offer an absolute solution, but the likes of Wellbeck, Cahill, Baines, Milner, Jagielka, Young, Walcott, Shawcross, Delph, Townsend, Osman, Sturridge, could all have as good a career overseas as they could here. Not our top class talents that will be in demand for our top clubs. But those second tier players that could play for second tier foreign sides for a period of their careers. I'd really like to see English players be a bit braver and look at a career as something to be experienced as a whole. Not just think about an extra few quid and the safety of having family nearby for their twenties and early thirties.
Covered at least 2 too many points there but there we go.
TLDR - We're the only nation that doesn't export players.