Spanish emigration up sharply in 2012
The institute says Tuesday that current population estimates show 40, 625 Spaniards emigrated between January and the end of June, compared to 28,162 last year.
It says a total of 269,515 people left the country in the six-month period, 228, 890 of whom were foreigners.
The figures are based on municipal censuses.
Spain is in recession again and suffering under the weight of an unemployment rate of near 25 percent.
Spain's population grew by nearly a fifth to some 47 million prior to the beginning of the financial crisis in 2008.
It now stands at 46 million.