Not sure if trolling, or really doesn't understand logic.
I ask again, why do you get to ignore deaths but include emigration to lower the immigration figure? You are picking which figures suit your argument and it reminds me of the logic behind the "missing dollar" riddle where plus and minus figures are deliberately interchanged to get a weird result.
Let's break this down to the bare essentials. There are 4 things which affect the population number...
1. Births (+)
2. Deaths (-)
3. Immigration (+)
4. Emigration (-)
So if you want to know what the gross increase is then you must only use the positive figures, you CANNOT include any of the negatives which you are doing by using "net migration" given that is the sum of Immigration minus Emigration. We can look at this for 2013 which was
Births = 698,512
Immigrants = 526,000
So 1,224,512 "new people", of which immigrants made up 43%.
If you want to see net population change then you include all the figures equally, so for 2013...
Births = 698,512
Deaths = 506,790
Immigrants = 526,000
Emmigrants = 314,000
So...
Natural Causes (Births minus Deaths) = 191,722
Migration (Immigration minus Emigration) = 212,000
Total net population increase is 403,722 of which 53% is attributed to migration.
If you still can't understand why you must be consistent with how you use plus and minus figures, then lets look at this question another way. Instead of asking how much immigration contributes to population, turn it around and ask
what would happen if we closed all borders so no one could get in or out of the country (No, I'm not advocating this as policy but merely trying to prove a mathematical point).
So with no one coming in or leaving the country in 2013 we only have births and deaths which as we see above means a net increase of 191,722 people. However the borders weren't closed and in fact net population rose to 403,772, a difference of 212,050 more people whose presence here is solely due to migration.
If I wanted to "skew" the numbers (as you say) I could therefore claim that migration has more doubled the amount of population increase than natural causes. Only that is statistically accurate so I'm not skewing anything other than the narrative.