Exact figures are not easy to get because of Israeli government policies. Amnesty Interational gives figures as high as over 1000, but the figures vary fom time to time depending on the whim of the Israeli government. According to B'tselem the figure at January 06 was 741. These are their figures for the following years: 2005 - from 596 to 848, 2004 - from 605 to 836, 2003 - from 539 to 1119, 2002 - from 36 to 949.
Israeli official: Der Spiegel report is an attack on Merkel's ties with Netanyahu (Haaretz)
from the article: Patriotism sans borders