the total Ukrainian population, 87.4% declared to be Christians, comprising a 67.3% who declared to be Orthodox, 10.2% Catholic (split into 9.4% Greek Rite Catholics and 0.8% Latin Rite Catholics), 7.7% simply Christians, and 2.2% Protestants. Judaism comprises 0.4% of the population. In earlier surveys around 1-2% of the population stated that they adhere to Islam. According to data from 2018 among those Ukrainians who declared to believe in Orthodoxy, 28.7% declared to be members of the Ukrainian Orthodox Church of the Kyivan Patriarchate (being incorporated as of the 5 January 2019 into the Orthodox Church of Ukraine), while 12.8% declared to be members of the Ukrainian Orthodox Church of the Moscovian Patriarchate (which is an autonomous Orthodox church under the Russian Orthodox Church). A further 0.3% were members of the Ukrainian Autocephalous Orthodox Church, which, like the Kyivan Patriarchate, where incorporated in 2019 into the Orthodox Church of Ukraine. Among the remaining Orthodox Ukrainians, 23.4% declared to be "simply Orthodox", without affiliation to any patriarchate, while a further 1.9% declared that they "did not know" which patriarchate or Orthodox church they belonged to. Regional differences Regional differences in population change Between the Soviet census of 1989 and the Ukrainian census of 2001, Ukraine's population declined from 51,706,600 to 48,457,020, a loss of 2,926,700 people or 5.7% of the 1989 population. However, this trend has been quite uneven and varied regionally. Two regions in western Ukraine — Rivne and Zakarpattia, saw slight population increases of 0.3% and 0.5% respectively. A third western Ukrainian region, Volyn, lost less than 0.1% of its population between 1989 and 2001. Collectively, between 1989 and 2001 the seven westernmost regions of Ukraine lost 167,500 people or 1.7% of their 1989 population. The total population of these regions in 2001 was 9,593,800. Between 1989 and 2001, the population of Kyiv City increased by 0.3% due to positive net-migration. Outside the capital, the central, southern and eastern regions experienced a severe decline in population. Between 1989 and 2001, the Donetsk region lost 491,300 people or 9.2% of its 1989 population, and neighbouring Luhansk region lost 11% of its population. Chernihiv region, in central Ukraine northeast of Kyiv, lost 170,600 people or 12% of its 1989 population, the highest percentage loss in of any region in Ukraine. In southern Ukraine, Odesa region lost 173,600 people, or 6.6% of its 1989 population. By 2001, Crimea's population declined by 29,900