Constitutional Court President Petar Klaric recalled that the Court was constituted in line with the Constitution from December 1990.
The scope of jurisdiction and accessibility of the Constitutional Court enables the public to check free of charge the constitutionality of any law and court decision, Klaric said.
He recalled that citizens could also request the Constitutional Court to set a deadline for the completion of long-lasting court proceedings, a possibility which he said was used very frequently.
The Constitutional Court will continue working towards protecting the highest values of the constitutional order, and promoting and protecting human rights and fundamental freedoms and the rule of law, Klaric said.
The number of court cases in 2005 was 29 times higher and the number of constitutional complaints was 184 times higher than in the first year.
In 94% of all cases, complaints were submitted by individuals and private legal entities, and in the 15 years 81% of the cases were solved.
Prime Minister Ivo Sanader said that an independent judiciary was unavoidable in the structure of any modern state, including Croatia.
"In the last 15 years the Constitutional Court has not always had an easy job, but its solutions have proved right in practice. It is our duty to respect the rule of law, and reform of the judiciary is a priority task, as is the security and equality of citizens accomplished through legal institutions," Sanader said.
Sabor Speaker Vladimir Seks said that the purpose of the 1990 Constitution was to give the Constitutional Court the role of the highest guarantor of rights and multiparty democracy.
President Stjepan Mesic said that Croatia had a 43-year-long tradition of constitutional court practice and that the role of the Constitutional Court was of crucial importance to the functioning of the rule of law.
"Decisions on the constitutionality of some laws are proof that the work of the Constitutional Court often depended on political circumstances at a given time," Mesic said.
Shortcomings in the functioning of some state institutions which did not fully comply with democratic standards have had many consequences, Mesic said, mentioning the non-transparent privatisation process.