RAMALLAH, December 29, 2014 (WAFA) – The number of Palestinians and Israelis is expected to reach about 6.4 million each by the end of 2016, with the number of Palestinians in historical Palestine (including Israel) amounting to a total of 7.2 million compared to 6.9 Israelis by the end of 2020, according to the Palestinian Central Bureau of Statistics’ report released Monday.
...PCBS’s report stated that the number of Palestinians in historical Palestine estimated at 5.9 million by the end of 2013 is expected to exceed the total number of Israelis by the year 2020 if the current growth rates persist.
...A total of 4,550,368 million Palestinians live in the West bank...Meanwhile in Gaza...around 1,760,037 Palestinians remain...
a. According to Yakov Faitelson, the number of Arabs in Judea and Samaria is 1.5 million.
According to the CIA FACTBOOK publications, the Total Fertility Rate (TFR) of the Arabs of Judea and Samaria fell down to 2.83 child per woman in 2014, compared with 5.70 child per woman in 1994. The TFR of Arabs had reduced more than by 50% in less than one generation.
b. According to Yoram Ettinger,
in Judea and Samaria, there are 1.7 Arabs as of 2013 (probably 1.74 in 2014) and 1.4 in Gaza (probably 1.45 in 2014).
and more here.