+<term><name>1977</name><frequency>3</frequency></term>
+<term><name>1971</name><frequency>2</frequency></term>
+<term><name>1974</name><frequency>2</frequency></term>
+<term><name>1980</name><frequency>2</frequency></term>
+<term><name>1987</name><frequency>2</frequency></term>
+<term><name>1991</name><frequency>2</frequency></term>
+<term><name>1992</name><frequency>2</frequency></term>
+<term><name>1993</name><frequency>2</frequency></term>