
Silke in the comments points to a UNRWA document showing the increase in Palestinian "refugees" since 1950. Here it is (transposed to make it easier to read):
YearJordanLebanonSyriaWest BanGazaTotal
1950506,200127,60082,194-198,227914,221
1955502,135100,82088,330-214,701905,986
1960613,743136,561115,043-255,5421,120,889
1965688,089159,810135,971-296,9531,280,823
1970506,038175,958158,717272,692311,8141,425,219
1975625,857196,855184,042292,922333,0311,632,707
1980716,372226,554209,362324,035367,9951,844,318
1985799,724263,599244,626357,704427,8922,093,545
1990929,097302,049280,731414,298496,3392,422,514
19951,288,197346,164337,308517,412683,5603,172,641
20001,570,192376,472383,199583,009824,6223,737,494
20051,795,326401,071426,919690,988969,5884,283,892
20081,930,703416,608456,983754,2631,059,5844,618,141
If...