Almost all Christian groups show a decrease in the number of members or less stable membership. However, in particular, the loss of members of the two major churches is noticeable, namely the Roman Catholic Church in the Netherlands, with a membership loss of approximately 589,500 members between 2003 (4,532,000 people, or 27.9% of the population) and 2013 (3,943,000 people, or 23.3%), and the Protestant Church in the Netherlands, with a membership loss of 737,174 members between 2003 (1,823,085 people, or 11.2% of the population, for the Dutch Reformed Church; 623,100 people or 3.8% for the Reformed Churches in the Netherlands; and 11,989 people or 0.07% for the Evangelical Lutheran Church in the Kingdom of the Netherlands; total for these churches of 2,458,174 people, or 15.15% of the population) and 2012 (Protestant Church in the Netherlands, 1,721,000 people or 10.2% of the population). Smaller churches (Mennonite Church in the Netherlands, Remonstrants, and the Old Catholic Church) had a total number of 22,489 members (0.13% of the population) in 2003, which dropped to 17,852 members (0.10% of the population) in 2012. In total, the number of members of Christian groups in the Netherlands decreased from 7,013,163 (43.22% of the population) in 2003 to 5,730,852 (34.15% of the population) in 2013. This accounts for a total member loss of 1,282,311 (9.7% overall population) of all churches in the Netherlands within these 10 years. These numbers are based on information by KASKI (Katholiek Sociaal-Kerkelijk Insituut / Catholic Social-Ecclesiastical Institute), which in turn bases its numbers on information provided by the churches themselves. Independent research in 2015 by the VU University Amsterdam and Radboud University shows significantly lower numbers concerning the percentage of the Dutch population that adheres to almost all the churches named here.