"In 1922, the British undertook the first census of the mandate. The population was 752,048, comprising 589,177 Muslims, 83,790 Jews, 71,464 Christians and 7,617 persons belonging to other groups. After a second census in 1931, the population had grown to 1,036,339 in total, comprising 761,922 Muslims, 175,138 Jews, 89,134 Christians and 10,145 people belonging to other groups. There were no further censuses but statistics were maintained by counting births, deaths and migration. Some components such as illegal immigration could only be estimated approximately. The White Paper of 1939, which placed immigration restrictions on Jews, stated that the Jewish population "has risen to some 450,000" and was "approaching a third of the entire population of the country". In 1945, a demographic study showed that the population had grown to 1,764,520, comprising 1,061,270 Muslims, 553,600 Jews, 135,550 Christians and 14,100 people of other groups."

"Palestinian Population, 1860-2000 (thousands)

YEAR         WITHIN PALESTINE         ISRAEL         WEST BANK*        GAZA         INSIDE PALESTINE         TOTAL
1860        411                                                411
1890        553                                                533
1914        738                                                738
1918        689        **                                        689
1931        860                                                860
1940        1,086                                                1,086
1946        1,308                                                1,308
1950        1,170        of which        165        765        240        304        1,474
1960        1,340                239        799        302        647        1,987
1970        1,412                367        677        368        1,289        2,701
1980        1,992                531        964        497        2,100        4,092
1990        2,731                687        1,373        671        3,302        6,033
2000        3,787                919        1,836        1,032        4,667        8,454
"

"
Year          Jews       Arabs       Total    % of Jews to Total
1914        60,000        731,000        791,000        7.585%
1922        83,790        668,258        752,048        11.141%
1931        174,606        858,708        1,033,314        16.897%
1941        474,102        1,111,398        1,585,500        29.902%
1950        1,203,000        1,172,100        2,375,100        50.650%
1960        1,911,300        1,340,100        3,251,400        58.783%
1970 *        2,582,000        1,045,000        3,627,000        71.188%
1980        3,282,700        2,100,000        5,382,700        60.986%
1995        4,495,100        3,506,900        8,002,000        56.173%
2005        5,275,700        5,139,100        10,414,800        50.656%
"


PLEASE tell me where 4 million comes from- Are you counting each arm or leg as a new refugee?